Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e89e4d546dee0a…

MALICIOUS

PDF

85.7 KB Created: 2021-06-27 06:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f6f4dc09b14a2dba106d090e3fbb139 SHA-1: 7b26410dc699870f820ee56170e4248b8fb4af23 SHA-256: 73e89e4d546dee0a073364614cbae8aa57f8d97c1d6db5ee786c5b4db6782be8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a phishing lure, employing a visual download button and embedding numerous links to external sites. Several of these links point to compromised WordPress upload directories, suggesting an attempt to host malicious content. The presence of a callback lure heuristic further supports a phishing or scam-related intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=android+1+mod+apk+kick+the+buddy
    • http://archerelectricsupply.com/userfiles/file/11555826818.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8694526a79---56262553972.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084f8e2d768c---tilunagobusax.pdf
    • http://marcth.pl/media/fck/file/5561637445.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-21/20210521070120281818.pdf
    • http://hanasushimenifee.com/uploads/files/43151542241.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/d591b8c398d919fbac841015cc2cd63f/sapujudinalur.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/8a3c8f04c97799b00a3e4dca17287339/53765341125.pdf
    • http://menafundinfo.com/userfiles/file/71813706289.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd43919cd0---65541355658.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/lmpiaukaiafgeno6m2ks7klq2j/kamado.pdf
    • http://gayaarchi.com/userfiles/file/20210605133508.pdf
    • http://global-insurance-broker.de/downloads/78022509054.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f70adab92---sebuletewip.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcf025f725---23491692730.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/73fef0a7d4363de60dd05eead8af42c8/40987739554.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/da81e995e5d193d16201f4eac4be261d/91370473372.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/cebc9367b9e88f331e3ccb6c74a1fa06/4307064079.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b39c92d0bcd---61833809748.pdf
    • https://classykitchen.pl/web/uploads/files/31623036676.pdf
    • http://susutour.com/userfile/file/35653158861.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160905eddca47d---99366953894.pdf
    • http://www.allatpatikapecs.hu/images/file/19627191566.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_off0000ec40.bin
01db05c0afa1929d54dc0ff259e0a2027fe64004540a699c64cf9b0ea717aecd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 17144 bytes
font_01_sfnt_off0001184c.bin
84bb19807b2b9c6271a3c217d08fb7d52db04874054d01dc3b9e1d763b2aa0c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1184C 11044 bytes
font_02_sfnt_off000131aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131AA 16792 bytes