Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0198aa3dd85ce5f…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 21:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d71b69df58c9b3effaaaca2afcc58e7 SHA-1: 4bb0de320e36d808f95d8bd4b15295d13af0a308 SHA-256: c0198aa3dd85ce5fc612d26dc19273b654c018437ddb6e492228a90a913277c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614833812da4f---vojoxovuwifefo.pdf
    • http://haki.vn/uploads/files/64477432989.pdf
    • http://ty6600.com/userfiles/file/22454758835.pdf
    • http://h04ydivan.ru/userfiles/file/zetejimijojola.pdf
    • http://ideviceplus.be/app/webroot/files/userfiles/files/soduv.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614637d0e85ef---19775860099.pdf
    • http://zkpower.net/upload/files/sitiropibulidevajilopuf.pdf
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/85341836467.pdf
    • https://suacuacuontoanphat.com/upload/files/pemewuf.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0240dee29---wonetabeka.pdf
    • http://cuanhuaabshanquoc.vn/files/76556908375.pdf
    • http://china-baby-clothes.com/d/files/26472970036.pdf
    • http://perevodvnegiloifond.ru/pict/file/manigegesixiripafavasubo.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404d04d6d05---98562254233.pdf
    • http://dpsnowodworze.pl/userfiles/file/gamuxasidatisasuj.pdf
    • http://gerastar.com/userfiles/file/suputijavotekavuwizijo.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/7d17e3a5d35c0f44024cf5326ccc50d9/savelivif.pdf
    • http://saveursetsavoirs.fr/image/file/99434191820.pdf
    • http://lindseyderence.com/userfiles/files/lajafomu.pdf
    • http://conservativista.com/js/ckfinder/userfiles/files/vufabure.pdf
    • http://goldendazzle.com/upload/quangtri/files/29602059865.pdf
    • http://voszveszprem.hu/_user/file/91226439527.pdf
    • https://episcopiaoradiei.ro/files/59122841712.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/puzowowomig.pdf
    • http://khamtribacninh.com/images/files/fumafovotukib.pdf
    • https://autohausnschmidt.de/userfiles/file/84407743917.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=k+means+binary+data
    • 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_off0000b287.bin
d726d00f43c8697b4683e9053ba9c2e4ed9c7a0bb9791ceec4080bca5483bd60
pdf-font-stream PDF embedded font (sfnt) at offset 0xB287 16472 bytes
font_01_sfnt_off0000dcf4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 16792 bytes
font_02_sfnt_off0000f50b.bin
daf4a0b46169579f8f90bdec1faed3cf49b5069112869c16bfb2171baa86897b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 10488 bytes