Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4daa41f5b2f9fe…

MALICIOUS

PDF

77.3 KB Created: 2021-09-10 18:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f861e65f53b6ca936a9734ab3341e5d2 SHA-1: 8647b396ebddc1cd64673e9bd0a3630a4a64bb29 SHA-256: 8d4daa41f5b2f9fe991f921c7863cbac6bbf82707efc60374e1cd06b40e38089
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pwr-tech.ru/userfiles/file/tuxeropazixin.pdf In PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/mejezagesod.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5e76545b6---11403227648.pdfIn PDF document text
    • https://premium-house.uz/images/file/xivikugajowevezatipakib.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/70042434132.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/81096755789.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2d0a9b6f8---76557258407.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/78150483773.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/69186952372.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132839c16c43---kanurunifusoduvetup.pdfIn PDF document text
    • https://timminsrenovations.ca/file/ZD8Me2FOc62mTxl3.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/xazuwidom.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349765f2b00---58812700262.pdfIn PDF document text
    • https://salonrewards.ca/images/file/tulidobebenozesovojo.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/11397126251.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/biwiguvatimajamomige.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210904_222647.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135af8f48f1c---lodunorumepamirenumebesi.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/pijobumijeruneta.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/95869584409.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/69923574903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+connect+two+bluetooth+headphonesPDF 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_off0000c6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FB 18360 bytes
SHA-256: 5b97ffb7d5c8557fc026989695d19d96d7c240453e845e4f65e4df9180bc5840
font_01_sfnt_off0000f6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 10916 bytes
SHA-256: 9773e4729a838767b2c9e8a2a72320bd9ac39a2444b2418b657fe9a36907acb0
font_02_sfnt_off00011000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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