Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38e74089145459a…

MALICIOUS

PDF

192.5 KB Created: 2021-06-26 13:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f88447eb71c8aeb1628defdba74aa55d SHA-1: 597271127a57d57b9a8b42343626895691f52883 SHA-256: f38e74089145459a796e4c3bf9dfda16fed19b4c97b6174385a9c4155e1b91c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. The document functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised WordPress upload storage, suggesting an attempt to lure users to malicious content or further infection vectors. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9692

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ph2020.org/FCKeditor/file/61612105979.pdf
    • https://schmitz.cz/res/file/nofemap.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acb57e8a715---62667680709.pdf
    • http://anhbanglaw.com/userfiles/file/neposoriderapekaruwo.pdf
    • http://abacusnancy.com/userfiles/file/bovojakumij.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d5c5f2b0ab18aad06953632b24aaff49/buxozufenikot.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/a6849bdb9f59b2a710ae3ff119dcf84f/dodugedusodojof.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ddf189473---lunakakolivalesumefewa.pdf
    • http://nenkin-t.com/upload_img/ck/files/88801303067.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c58bcbf119---10182120564.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/r7hh0mvd9mglveodjocq56k9o2/ralox.pdf
    • http://pmmagic.vn/userfiles/file/rozinotot.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33998a98b6---14875189731.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1fd0a4c44---lovepixujamasupot.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0ee40be825cc392d295fe406230e7a31/39179110843.pdf
    • https://digireg.it/upload/64737633518.pdf
    • http://hibertek.com/image/files/20210625_095913.pdf
    • https://artbynela.com/uploads/file/62282299566.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/6c78d585815b67d12082370a62c77f17/82331621016.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce14428f2f---lepixijajutisa.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/9b684e5f0381c061e0bf7f185354fe99/ruxovonavuguzuk.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828e32e3186---27310011446.pdf
    • https://atphp.ch/userfiles/file/16225782647.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/40148005161.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=persona+4+and+persona+4+golden
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002550e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2550E 16792 bytes
font_01_sfnt_off00026d20.bin
9ce098c17f8d082d038f6a1102260ee919785056a2a5e1b5b13a14eb27d90a69
pdf-font-stream PDF embedded font (sfnt) at offset 0x26D20 25776 bytes
font_02_sfnt_off0002ad72.bin
2d5fea1a0884b49435fb68955f09f196557fa1009040ece309c43175fb6b7237
pdf-font-stream PDF embedded font (sfnt) at offset 0x2AD72 14636 bytes
font_03_sfnt_off0002da8a.bin
715058fa233b852812f4384b0a21074c4d502c374a11c1723e3b57552fbecc01
pdf-font-stream PDF embedded font (sfnt) at offset 0x2DA8A 10456 bytes