Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7abe681fdefe67…

MALICIOUS

PDF

92.1 KB Created: 2021-06-25 14:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f2b9db78fd7fedf7fd19d9d2f7d4448 SHA-1: 30241700563c79c164670347a4419dc9c8ecfaaf SHA-256: 6b7abe681fdefe67676c1cd1164da1d6cdf03f6f127ad7d22c7edf48bdb13ffd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic further supports a phishing or scam pretext, likely directing users to malicious sites or to initiate a fraudulent callback. No scripts were extracted, but the presence of multiple external URIs and the overall detection profile points to a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=a+binary+compound+made+with+phosphorus+will+end+with+the+word
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/613q13bai15eupucm4o12acr2v/45912889472.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/42679208089.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/764707eefb6c2383deec076a7c1c267e/nenukerixejetutamemekomu.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9db35b5e3---22141974970.pdf
    • http://vorne-sitzen.eu/pcms/content/file/xodufunuvuzivu.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ngdu1b0kjqpg7moenn6jnuinm0/gafijof.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f8ae11864e8f3cd412ecbcc20cddf601/pigalekanobugova.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609550d4aa620---gewufofatupajage.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/63f275b8134096f53f84f0cd77def68a/lukikerugosepewalinupilu.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/eguha8m6h3s6a2ke7l4b81h989/rituxipekirusorimagunim.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a184a324d1e---94779583173.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8f9a50019---kikefapetobegoru.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105ff.bin
808abf9daa7757c7c10bce8e521e1870a2f489020905b69ff0686004d21ee950		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 16856 bytes
font_01_sfnt_off000131a3.bin
44a19793c3732b82bbfeb1831c66972e78338a34f73a5d9ff4b989f66998655d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131A3 11200 bytes
font_02_sfnt_off00014b8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8E 16792 bytes

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