Malicious PDF — malware analysis report

Static analysis result for SHA-256 2110fffdda9a6bd5…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 04:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 332abfdfee64f5d66dd1c6da7e5c9601 SHA-1: daa33bed458739a74dda909725aaacff6314d726 SHA-256: 2110fffdda9a6bd5b9f6e0063b7d31a6e0bd1c7df333790aed96de6c9d820741
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to abuse search engine optimization for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://irlanc.ru/uplcv?utm_term=fill+in+the+missing+number+worksheet+for+grade+1 PDF link annotation
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c3762488417ab645cd05c6bbc12630c6/28849942735.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f8a8947ed---tesovitekozizuvuvozik.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28c5c452db---xafanofafibozozi.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/75777091017.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096170e5d2aa---23957575032.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/35808444711.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/cae1505efe0d3f0143eb1e89c218e824/sobotijuliladomatabufe.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/80939813078.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/takudelubob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613645f90262a---zujepiremakugugufosiveg.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e75952ff4d51c642b351f0f804ff64d0/lulafap.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/bddc7537569172cb3da5456b9b667e56/bogit.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/62835242570.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/89693375895.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/64590652282.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/11aec0ef8b673105575fd8e8da418d0e/49147475681.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c93ce85eb---97659946100.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608305433bb2a---21279533570.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/81869016127.pdfIn PDF document text
    • http://ewtch.com/upload/files/bukaxokolelavegotovotefu.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/nivuzokasokobole.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/68580175499.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/buxiwebevegifawu.pdfIn PDF document text
    • 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_off0000d3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 17956 bytes
SHA-256: 2d3a6383f04affdca8bccd001897e2822c95102911ba41f5220a6e998accfba6
font_02_sfnt_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 11248 bytes
SHA-256: 88cdf03bb0682c4ff8ca6eae544adc1d09461b3aebd5940abe5558ef2ef46c16

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