Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b279c8d36a66a91…

MALICIOUS

PDF

99.4 KB Created: 2021-09-02 12:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e1d18374e1ced52b0e83e7e9401a4cb5 SHA-1: 77c56e6ed53982ad2df0f547d5a973ae14d21b36 SHA-256: 3b279c8d36a66a917fd9ba81af3ea2b5372165beefb3355000286f5b92a2c3e1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, directing users to potentially compromised websites or to call a phone number. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=honda+jazz+2014+service+manual PDF link annotation
    • http://93564497.com/userfiles/ruwogoxakevag.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d99dc69ab69---bujewekoxeb.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607750d7d2f7e---28588608645.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/xupezopefelidedonituje.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/94444671592.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/5ba8f7c8953178afb1ac9e819b395cb2/givonikijilexot.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609732c1bfeb5---79330845231.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/69953522739.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6a4d10ca8748f2ab99bc7a29c67477d3/26284349556.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/fefolem.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/nitujidulatizulibifite.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/pemuge.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/17269749527.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/zizuzititufuw.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202108281008034278.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608007630c02a---29877453478.pdfIn PDF document text
    • http://scro.ru/pic/file/64818776599.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/21711034446.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/soxatun.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/42114989921.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/kogobedi.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/60168191094.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/gezebesupijafiduwi.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/80259665575.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a53cebf8bd---7169386946.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D85 18452 bytes
SHA-256: 08ffd4c4199624ee7755b7fcc5311924d0db5e2f61f50573d065b5733166a0a4
font_01_sfnt_off00014d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16584 11152 bytes
SHA-256: e84acf432d0c283be351b0b116d046aa6d2d08ba43b360921fe99566bb6ad202

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