Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c96c57bee7712a0…

MALICIOUS

PDF

99.6 KB Created: 2021-08-02 22:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3c04f84a5f60d341c8e59749e386a98 SHA-1: 7943879e0d5777ba1c799bc443ba326be1bbfa16 SHA-256: 6c96c57bee7712a0c5e54a84befa68a8254aad0456a9f9f0257915ac829c331a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=movimiento+rectil%C3%ADneo+uniforme+acelerado+definici%C3%B3n
    • https://ijmscr.com/ckfinder/userfiles/files/lomorululimamefezajux.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2fe541d478---nikugiwexejiziwik.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dff7154d7f---95617586732.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/mhhehr819ro5ne7crcucec17g4/dazikafurujinufotite.pdf
    • https://alexandrapanayotou.com/web/images/static/file/11788944500.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/3e797e3a129dae66a9c00205e3542f7d/wovedanajizefite.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/10a1527bd9e3cf09b57d2bbff174741f/76909843369.pdf
    • http://hongshengfish.com/uploadfiles/20210525/2105251514002714306v6w2rgf0vzm.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/3f71c2af443b0a78f81c577eb78d05b8/21546893729.pdf
    • http://berbun.com/user_img/file/fekar.pdf
    • https://a2designbg.com/userfiles/file/gujalokizorabararo.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c7719715bb54b42f35bb381c207b7db6/polukaw.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4eede7cb1---bixerezavomesore.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vfnl3sj1mrc64snn2pk9n48r4u/xabokezojezavafaju.pdf
    • http://studiomuraca.eu/userfiles/files/jagutalorerivozegenamiro.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/402a377d4a4568b6bd3c52481df3ee64/kowotiveragoxeso.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cff61e910d---dewupupimuxeni.pdf
    • http://klhl.com/userfiles/file/pizatama.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/685qs760tug16lnikinhtc29t9/fatixoxaxili.pdf
    • http://fujavietnam.com/images/Download/soropefuzubegimaxu.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/46107033118.pdf
    • http://g-shocktou.com/user_file/file/pizugulururulosixojo.pdf
    • https://secolink.sk/userfiles/file/32520471955.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607edc73d5e29---zaliloduvuj.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_off00011901.bin
7f37ee4f2db11d1b4207cc2ee6790761a494db83863b863c8c9c07008c26a105
pdf-font-stream PDF embedded font (sfnt) at offset 0x11901 10828 bytes
font_01_sfnt_off000131ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131AB 16792 bytes
font_02_sfnt_off000149bd.bin
ad86eea8d35fc0f4994131e6b2aeed155b0d226dfa17cb8a825c267ea8778aaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x149BD 19632 bytes