Malicious PDF — malware analysis report

Static analysis result for SHA-256 487ac93f9b945641…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 23:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b937b27e55abe36c4bcbed5d17724e0f SHA-1: 497a8103cd61e909a16f90dc8699127785848758 SHA-256: 487ac93f9b9456411d4803b058dd3f14bc63eb03e1b44f2b5a32cc13b3a7a10b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, a common tactic for hosting phishing pages or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609159756c5c7---13337924063.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6400a50ac3---rimikejuvubujeveri.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/66996117176.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/47389239725.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863451c201f---temeruduvigigob.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c51533d62ab---50927976569.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/bazif.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/roxoviwiletosanenejix.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/2ou9j62j6tt38b2qm2qqtlhgdf/47821916447.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c80da6f42---11288173488.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161257db109ee6---fojojawipot.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/46b9698e3b32ad053539f4b242cd439a/70363201292.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/03b64b7686b8b2386d724aef1166d160/zolekiraxodubifujojab.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/88113947615.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/4ca99b59778cd9283d481007aff88579/84884080510.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ed714561c0d---36979635143.pdfIn PDF document text
    • http://falerisztika.hu/tmp/78700869189.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/46715387817.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/62623862213.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160e513472e7ac---2717330833.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/40900959978.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/23048819548.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/bumifipabapikikut.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/zuzozagotozukedexivob.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086a2354aa5c---wumapezosowufozoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=wagner+meerwein+rearrangement+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 19352 bytes
SHA-256: ac7f677722960baaaf92f75c406d547339951fd484934e1d48603f6ca09d7599
font_02_sfnt_off00011922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11922 10584 bytes
SHA-256: 93f05a2713df3f4602bdcc805e2f4df88aa2ab90df0f3db8e758c0f1ec4cb8e4