Malicious PDF — malware analysis report

Static analysis result for SHA-256 611197b66c0dab91…

MALICIOUS

PDF

82.6 KB Created: 2021-07-06 23:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9bae9792db2d9757f7f0449bcffa653 SHA-1: 1ce0a7a4df7b5446fff4d80312d40306f0500496 SHA-256: 611197b66c0dab914ed1e99f128e7ee78ccbfb4e7424875dc1bdc30cb331560f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns strongly indicate a malicious intent to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://philabc.ru/uplcv?utm_term=distortion+energy+theory+for+ductile+materials PDF link annotation
    • http://ahkjt.com/upfile/file/16490508307.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc8b1aa45---ravefido.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/29476346000.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/pigut.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6417bbd68---56117983564.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/38951534651.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/gomajozeje.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/damedomi.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/e3441ccc5ed345dd012e7bf852d8d1ce/zilubezixukaf.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/41544811454.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc45ad4ef9---ditukopojubojonupok.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b86f52e31e1---weferekanijaneti.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/31364414164.pdfIn PDF document text
    • http://capital96.com/userfiles/file/7912377312.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c519bb51d0---pudoze.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/gorosobogawebefi.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dce35941fb---wituxepagasetuzoluwug.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/67997241171.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/4amh0jl26cr0v7gp955bpmcqac/vuberonotepotugizose.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/69541920295.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c96c76cec26a61ed30d062f9ec36c884/41320836980.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/f6ki1k8chef2tuivcv52p4be44/31553991988.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_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 11140 bytes
SHA-256: 74303a1d5b5178edbd1206756d5934287cc735d08a3e9f93491039b6efd48089
font_02_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 18504 bytes
SHA-256: 8ef21d56ec2ec9db0a4620685b94586c075aa76f569132455a7f6b35daa8b47c

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