Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec2a2fbbe447a3a…

MALICIOUS

PDF

115.7 KB Created: 2021-06-26 17:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 08a1c7871fcfeb40c9462f45543116f3 SHA-1: c2a2e04cab20fee138a104a427fe0545bee08eda SHA-256: cec2a2fbbe447a3a24cb11dce3dacfe468294f9a78c5a506a8ae15bc3889d990
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites hosting other PDF files. This structure suggests a link farm designed to redirect users to external sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of multiple external links is a strong indicator of a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9234

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/269aa6489722ed39b2c08b1d19c6d274/rafewoz.pdf In PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/f5a5403b9650f97abc03e47897dca2a5/40528011351.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/1p14vb3sbj4kf8rp2eiij0r0ur/27471064139.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7fd4ab86799d8aca8076549db9f28313/jazujijisakejitijosofotep.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070fbc4b1b36---wadexame.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0473cb493---zuxeres.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6637981e90---40607098757.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/21615210901.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9c9ceb8c316a3824196a905bb3f09717/67352677899.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab9be191d---nopitolosudisorobilef.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160afb8195a977---kepixekivogevekibubegoga.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e36d0609e---fafewexunox.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/rumebewasajupowajiloro.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/32fa8aedd71cbe99cefce8cc9770dc7f/63251533521.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc13b5d1a66---59501708518.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/7668a8ded5c4e8f97a45d8471750eb45/liruwatusatalux.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf0a035f96---waniposugavojoxiz.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b8424f911dc---36926054391.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b89118b5f9c---4861128736.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16090a23ed8b11---tabofurusonuj.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/03fa7006357ee3b1e896948da750899f/fofokomupof.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb6c7b4b04.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/83c895f3495baf51de0551aaa43e4a45/93410271941.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/fogosibiwixeke.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/b28af58227191e85ddc9897ab366a7fb/80413384289.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d387ebd34---kinefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=all+might+rising+ova+release+datePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6F 19180 bytes
SHA-256: af8df65fe9c3a647fabc99d04b7f16b47ab08a806466c4282567767ad62e3664
font_01_sfnt_off00014213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14213 16332 bytes
SHA-256: e30398e86bc9198bb2e417f916c8ed2ea33a6d1127b3a9e9c9ec8b72f47ba906
font_02_sfnt_off00015824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17032 17700 bytes
SHA-256: 0df236bfec3f25a3f9d388c3f7b7a985145c9c98821992421010ea8ce7fff133
font_04_sfnt_off0001a79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A79D 10740 bytes
SHA-256: 62e0e11944df24fe91c5e7ad6b5abba066e135adcd649de6e9ea6fecc0c9a7e7