Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e983fe2646ad99…

MALICIOUS

PDF

69.5 KB Created: 2021-06-05 20:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2e3c7f2405753b41c88a0cca612faad6 SHA-1: 69fb5b18fdd76cd04c608b426c88820ac3892b39 SHA-256: 41e983fe2646ad9957e5d8e5e1ff1bbb91e83e79ca87eb5c614f6a77e80b023d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier output of 0.999766 further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=free+phonics+worksheets+for+year+1 PDF link annotation
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/e45e5ea0a40c87e6e3530eda59278043/34987057694.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/29272081285.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/21766047260.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/66257681673.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/6a1kdc1olgg2rqd92lj0egjmc9/remubumupasolozotek.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088f6c23970d---jadobolimimu.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/1752980b3b63a931b5b04bb8dfd03bfe/zorow.pdfIn PDF document text
    • http://ahchala.com/img/file/70915378477.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/es6oni52c3rf7gufkbc0jt1c7v/xamotezureve.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4361e3bee---sapenujupenor.pdfIn PDF document text
    • http://surtek.biz/image/files/20150120_072802.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/runimapuw.pdfIn PDF document text
    • https://bem-sa.com/img/file/jovusezukakinufux.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b77ecd50860---96190780282.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/givebamovinofarujaka.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607204168ddfa---94394842040.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/84727563500.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B3 5336 bytes
SHA-256: 6f676a2657f81bf63c6487cdd36b43bc707addf7bf02fce142a90cc39ac93a22
font_01_sfnt_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 10872 bytes
SHA-256: c49930a167bb12e0e7146e44fa811b5e09f41595c7b91049119483fd940d3bbf