Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa111e89e845805b…

MALICIOUS

PDF

134.1 KB Created: 2021-06-24 14:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 900fd5eab1e6e50191f707a6ac795b12 SHA-1: 2f838ed2e0572f4d647502d2908174b71234fcc6 SHA-256: fa111e89e845805ba9a6d4e8ba0c6b5956c22390676fe3bb06a61c68dc43c9ae
176 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic indicates the document may prompt users to call a number in a deceptive context. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://mnogonomerov.ru/uploads/file/fajefofifakokobovamil.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5d4680dbdb4f285cf8e812a3664ad136/22003313174.pdf
    • https://arhometutor.com/userfiles/file/fikulani.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160868d56313d4---28211293392.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32a54cce72---23324333175.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/aa7qpb9gommrfoppkbohlpq427/temopoji.pdf
    • http://liyangah.com/Upload/file/bisinaxila.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/18667508809.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/96231983309.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/b99b278d9669f8d42fe7c94c0cd80170/lokavoperagima.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/scn99bjj4mu5huovm0qkvv4oot/segitepa.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609499597c912---rotiluvewitasudupogin.pdf
    • https://medsplus.us/admin/images/file/12703953311.pdf
    • http://matsonconstruction.net/userfiles/file/muvomabugovolepifabete.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073781bac461---bagojategofonatijute.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/76ce17cfa5c72d150ece256eec864103/jalozobavewedepipajit.pdf
    • http://01host.ru/userfiles/files/jugodoponakujeje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=neuro+ophthalmology+review+manual+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ce27.bin
8979b6f6c5b38f4c61a68d4815400995d3f8ff8b0943ccbd63efdb3897834f1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE27 5500 bytes
font_01_sfnt_off0001e0d9.bin
76fb0b8835a74ec969bebefce580c7483c221346a5c42a115fd1ccbb6d98cf71
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0D9 13548 bytes