Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1037236499cb83f…

MALICIOUS

PDF

103.1 KB Created: 2021-06-27 15:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 618d35306eae532f583a5acb8e1fe54e SHA-1: 3acf3760335283788d60d1fcb144413b4952cbc1 SHA-256: d1037236499cb83fd140aa2ba80e96c1dd885dc6528b7f4f969921fb6bbb8f93
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm or phishing distribution mechanism. The heuristic 'SE_CALLBACK_LURE' indicates the document is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. While no scripts were explicitly extracted, the ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links points towards a malicious intent to redirect users to potentially harmful content or engage them in a fraudulent conversation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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 https://cructi.ru/uplcv?utm_term=norman+s+nise+solutions
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2def96a67---nijariwozanigurufugadise.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/503cda386d954a41f80dc7c2024672b6/fitukuranomemusadosizire.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ufmpana0rdcr29slcrop4sm41t/46554292570.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c1db50bdc---jikogoxaritugigadegov.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b1a96ceccab54450f8e0aa4a2fc17e79/41799785417.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084139fc8034---20002778482.pdf
    • http://drukarnia-skawina.pl/app/webroot/media/files/patuzajilem.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c230832f90612ef78b1a90d80c2d2e6a/ruvonesekutadume.pdf
    • http://agiusfuneraldirectors.com/files/file/780336933.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074d9c8e12be---vosilolugunezidominakorer.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746f2849ea4---74970582056.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/43cd5d9866c4ec2077f49f9eb76db7d9/nafepetaxebukaleges.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/81a1e6f6c8235ce70995b5f329324e77/1849532906.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/cde7f5834f16006b12814900f4c3669f/wijoluj.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c709982292a---zovobuzosuf.pdf
    • https://asiarsolutions.com/userfiles/file/ruraduzevu.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/h4aipt1l7ulgt91ubkel1fjm6v/fifobibogofopalura.pdf
    • https://vestol.bg/files/file/98298351765.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d244ec101e2---bomagetavigixojunofa.pdf
    • http://iseveranscopy.com/upload/editor/file/30556842336.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be12c1f12cd---pibewoninaludusadogal.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_off000127ea.bin
26d160c4e7d191312cc6049722cde1c1e53ea4d660726c9ea039822f91bce34d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127EA 10348 bytes
font_01_sfnt_off00013f3f.bin
b7674e978d2137f776acd853224540004f7935af2c1ddba9113bbbb945d31037		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3F 20636 bytes
font_02_sfnt_off00017791.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17791 16792 bytes

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