Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b65f72c06b27eb…

MALICIOUS

PDF

117.6 KB Created: 2021-06-29 04:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edda6eea81d06f9dcc317a3f32134db9 SHA-1: 7ae6b68ef6f9fb5fe25e7de458e2f9bbeee448ba SHA-256: f6b65f72c06b27eb7feaa4d0ed86d2d1ec6a5b09dc4f354c5f8792aec05bd61c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, a common tactic for phishing or distributing further malware. ClamAV and ML classifiers strongly indicate maliciousness, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://martom24.pl/martom/userfiles/file/91982771203.pdf
    • http://teplospectr.ru/images/files/11067618559.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f021d4b1e0---nodigagosuguw.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/57d08e50df03c8386f9f33ae5e3f1c40/43112491167.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b7e372b11---71526962171.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/dadc36b5576655d7b902b55b305e61b6/78760059317.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/e8947460b22249cda0688afcaf74df87/xefelibu.pdf
    • http://nirmalamathachurch.org/cms_uploads/image/file/84844872420.pdf
    • https://soechi.id/userfiles/file/4898670216.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8e584e646e1c8c6899b87a4194c79e0f/falope.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c8dc01011---91628435204.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608165463bb0f---nawali.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/58a8fa049b0a72c2137136f39f2866f5/biwapagelivanizelotot.pdf
    • http://j-line.ca/fck_upload/file/ruxesejevaverodazebozepa.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/64b90117c71fc825da4eca74b5014038/83934728765.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7f00d1084d487fef591e756eba43871d/61304176523.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c672437608---jemeni.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609c34d5ca318---vabomukamizuridar.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/t2mp03anf87vobg7jdhaka5o2o/wegaboxiledobujipiwajo.pdf
    • http://activesolutionelectric.com/images/file/fujezuzadawuginof.pdf
    • http://hani-bee.com/userfiles/files/tugafibigod.pdf
    • http://asiadomainstore.com/userfiles/file/nobilupiberipunodubawi.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a1bfacad3---90268640227.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/mai8raug4eufke67rlmtd6fum1/46623045119.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=i+brought+it
    • 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_off00016f71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F71 16792 bytes
font_01_sfnt_off00018783.bin
fa26fef7a8751cfeb476689604978ea36b79b5f2fd856b3be4b9a20eec85b395		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18783 16976 bytes
font_02_sfnt_off0001b363.bin
f8580b8be6f8d7c3f1888f77d837a12ae8c9c7d3b6fce8997fd39b335073cf47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B363 9964 bytes

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