Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f634e4dbc207930…

MALICIOUS

PDF

147.7 KB Created: 2021-07-03 14:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7f08999a59d7f0ca9004ffcf1406e79 SHA-1: 2fc99be4d65fc0ff1a8acd241d397686c433f8ad SHA-256: 8f634e4dbc2079303b80634b7786ff99b82812d889faf3c4829430309840bf4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories, likely intended to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to lure users into clicking these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b6ff218a53223705a3e41e6cb8779892/49805827762.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a23fd4b5516---38406602315.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c6f7d617fb82ef56c7dc102139e70f50/31866038100.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/1bdrds6ccjklj5a2p13v5m8kjq/50168612230.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/93449c5c1166a7c70744cf88d3d75807/xixinojavesebevixoba.pdf
    • http://auxerretv.com/content/public/file/48848870480.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/90o65drvji4bisijr0vtesftqv/51484033799.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96cf482e9e---liliwemijanuxuv.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84edd93b1d---77037144362.pdf
    • http://netinflux.net/userfiles/file/61578752859.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe42c64ca---14780339061.pdf
    • http://moestuinwebshop.nl/userfiles/file/50933533928.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d10b0a70644686ffddda3035f3bdf606/bulawuwefit.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e2d8ddd78e9acca6752f1e8f5276ee56/nodonuxodulufezirip.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a02132789ad---96027028551.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f0187e253---92022600194.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/b006f50da773d35f2c26577a4066371f/wamazomago.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/dam5eqirbhllkov14vfmnko73n/vokizorumaxarogipeju.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe268530f6---3597464449.pdf
    • http://gorisum.net/fckeditor/upload_file/file/vuvatebopaxom.pdf
    • http://tubietelbar.hu/uploadfile/zever.pdf
    • https://everestart.com/images/stories/file/28337729121.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=two+port+network+problems+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d77d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D77D 16792 bytes
font_01_sfnt_off0001ef94.bin
69136a0a52b23cc508eadbdf7aec0c5b038ce46b4c6825cba74e8875de1cd9b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF94 10684 bytes
font_02_sfnt_off000207e5.bin
a184437057000daeeb74212f57fb2dad54e6ed2865e9aa863826a8ae5a5bcc4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x207E5 18020 bytes
font_03_sfnt_off0002379b.bin
952c3d74286018ef8a0df42b11e7fd15869b2088710e63c458e48c6761bf5cf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x2379B 1756 bytes