Malicious PDF — malware analysis report

Static analysis result for SHA-256 84521289d0cc8166…

MALICIOUS

PDF

95.1 KB Created: 2021-07-01 12:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cd2cc8d4bf6021895543a789209d240d SHA-1: 56894421e450c1ca20e4b2f1bab0c8f99ef44ef8 SHA-256: 84521289d0cc81667f78eff6668fc2672638b270c55a34bca1968fd6516f84ee
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to websites, many of which are hosted on compromised WordPress installations. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 https://infrive.ru/uplcv?utm_term=def+of+immutable PDF link annotation
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/98d9ed16995119ecc05a1863ade00601/berefogeliraxepefadejuwow.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbeed217f4---vexenuxen.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7535b221c---basotidowajujakizeba.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6b930403e---bidegolinekiwexezarud.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086c8e0299cf---90212621406.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/64553389087.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/gv1o41q7gkjbp0h315tth34ol1/jatitit.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/43345591518.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/44b3b167595aba697123c70fd45af8b4/luxepotizimatiw.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/ninozatuvejutowe.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/63626380616.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/bf1e616ea30570d2b37730ba893221f7/36674958761.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/93073705687.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f19a3e01d---vafewametulanuvinolagimat.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/95624721134.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/30b33832df593dc0cd1579feef65f523/5374542622.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/8272638741.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c666d3577---rulonopafexud.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/32027072259.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4349e6882a87d60b1da8fef32769d9f9/xutivuxajatezi.pdfIn PDF document text
    • http://schokozentrale.de/idata/86914002233.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/9f53856c5c1ce432e6c640310aa09bf4/51008323740.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/69025529610.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/1c84e2460058506c3ebf980ebdb17391/sigibavabifidi.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ffb8cfb2926d1c8be809b13f479da55/bifediwusabame.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 10244 bytes
SHA-256: a8a0847ada81ee22de1e1e815f147def6632fc57657b8990fb42eb828e367ced
font_01_sfnt_off00010a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001223f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223F 16064 bytes
SHA-256: 313b4d1b1f982e25284d2f4e6caf7c0c7767db1f375da95b613bc7d89e59efd8
font_03_sfnt_off00013751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13751 20400 bytes
SHA-256: e2b06b7aa297a6a9a93f3481538e6dedf67bbe6e8529a76450fe969f955a3325

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