Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bfe84a4b9316d7…

MALICIOUS

PDF

86.8 KB Created: 2021-08-08 01:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ebdf0d485736a68c6a4df9bc182eb650 SHA-1: 69122a64156bc22d20dc3c3e32305bc47f79ee8d SHA-256: 73bfe84a4b9316d7be7cf601a84df3d5fa8fcf92b8b8031f516e55c45c5fbb24
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to potentially compromised websites, suggesting an attempt to host malicious content or redirect users. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/82daab300b7062276fc9d4ded01747f7/vumalakezo.pdf In PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bc5516ee3---87253495385.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d1e9b7dc3a1881b357d5aab80570bdc7/nonamuporenebomugofukox.pdfIn PDF document text
    • http://gdgom.com/upload/file/210703012607806637lam9nxom1jhj.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/r4fki1e956t5r7h59ah8r829pi/67280376533.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/397d17db02feed25225edd99784f3ccb/nobegodo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/beluzazejawo.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9f9be2751---sefisor.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e3b052513---doraxoliked.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160714538b220d---nubiwaxowivijekudig.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/lifitijosetow.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/aada97a1d75f2b0a7e58bcde14b7911a/sikekulolijewejoja.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/6236629484.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/vekagazatuxun.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607917225c021---xolewodidige.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b386e572b1c---kijoxelowufix.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ec4362081573cfd326e8aa2b8e9c14fc/buramegosusolovazutikopek.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/11359169728.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/minazugizazifeke.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/dotaxevekasegof.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ececb715f9a---27120920727.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/30670486457.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/buxifusosejus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pick+and+pull+inventory+stockton+caPDF link annotation
    • 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_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 17384 bytes
SHA-256: cbbdda029ec2505e0351836121c90979ac676c7d06fcc9560743c25ff734a134
font_02_sfnt_off0001313d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313D 10880 bytes
SHA-256: 81400efa30418c2fbd3b0bf86623267ae3343d18bb318365b8f7c50765b45afb

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