Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a0f30cb8a8fa0c…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 01:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3b64e7c8809824f49451c1a34f75110 SHA-1: 9dd2e16a08e6361976403c1fa3cd446e01a1b940 SHA-256: 60a0f30cb8a8fa0cc9862a0fa030b8a4785bb39abcab0e0797b80451f9d0e599
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The document acts as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests an attempt to leverage these sites for malicious purposes, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malicious content delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/uplcv?utm_term=infinite+flight+simulator+mod+apk+all+planes+unlocked PDF link annotation
    • http://studiosiciliani.eu/userfiles/files/miperazukowevivokirobewox.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/fapiledafakanum.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d86152e3d8---69827420904.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614dca6019ea1---pexati.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/pebejesekibisodigoranuvas.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/58370135102.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/1828266186.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/84920935919.pdfIn PDF document text
    • http://rentaruedas.com/files/others/zawigujozunawimeb.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/15694210086.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210908150846.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/21366756836.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc40126af0---repunudatevudegimo.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/27908653680.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aded2ac04---nokusutirezexobude.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/zuviwadodap.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/filawakidutaxixukejab.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/safidusodasajopa.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109090401482647.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210925165518.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/52361022939.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ab160984b62f0bc1e3adea8e006ec0e8/62032236359.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/84232877027.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/91808448065.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_off0000b007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC819 15036 bytes
SHA-256: e4c1633fc03b1b5e7f9b1ede9e286c7850534c664c1eeae5dd101a8b8bd7a4e9
font_02_sfnt_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 11208 bytes
SHA-256: 7938bbafd3d5ecefb8ae42333c2bf721659050f327820f4a8f5cfff5fb0fcebf

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