Malicious PDF — malware analysis report

Static analysis result for SHA-256 8151d529f27cd12d…

MALICIOUS

PDF

85.1 KB Created: 2021-06-26 13:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 337929abc33bfbc4e7abfd3bf1b81519 SHA-1: c631a7e13ccb0a3edbc9b733012ea89e60855804 SHA-256: 8151d529f27cd12da285baff3f86ed20857ff2132029d507c632fec480aa741c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a large number of links, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983498a51e4---75720238233.pdf
    • http://ed-web.cz/userfilesfile/jesebelalawova.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b192035040a---64453322302.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b542ff4b016---jodusomimit.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7314b6298---nutiximolu.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/59224afde1e1b580435f541da852b4ab/vamujufaribilejunim.pdf
    • https://abugfreemind.com/userfiles/file/83385959128.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/6d7e7d351b8ed012d540e9c0491152d1/53059848541.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/9d2761c7df8e40b81ed89957fb580a70/94836657119.pdf
    • http://merwepizza.com/upload/file/70636508991.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0289a2eaee---zumuwuzodogalosugolinir.pdf
    • https://prosperitas.be/data/assets/file/towutafimito.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e15d285aa75e5451115458c8c36f073a/bovagozawulisukiliwi.pdf
    • http://mikailang.net/userfiles/file/20210503020054_684807701.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d00a770fbcdbf633c9aa8e261c7acbb8/58973596540.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/muvifotakitotetolatibow.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bc0831de---mugirumosirigimotijit.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/1510935a41212978528fe61ec57153f5/58650748311.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b033c043a6d---11849473204.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ef4bc45c1---29831853206.pdf
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/8ta2k293vnnril6p99c152oog5/numozoboruwaf.pdf
    • http://netmutum.com/userfiles/file/90916166858.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2f1b91a88715179ff1117566645f2bf4/debetegakopezixesijoke.pdf
    • http://i-daa-wl.de/userfiles/37097004790.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=there+is+or+there+are+a+lot+of+things
    • 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_off0000e99f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 16792 bytes
font_01_sfnt_off000101b6.bin
a2faf331e00c468ea01308d901cf9ad4026327b9b06f254345ef59e97140f02e
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 10456 bytes
font_02_sfnt_off00011969.bin
7b5e7d2d6616790b7abdcb1bc04cdc629e5255b50b1c42fbf8a3dbf7765ab9af
pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 17008 bytes