Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc053b4686fd387…

MALICIOUS

PDF

86.2 KB Created: 2021-09-02 07:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6978a27d263dd1560057d02a5593c921 SHA-1: 6a2d7d8b81e001e0d7f4edf48781541928dca21b SHA-256: 3fc053b4686fd38712c364852fd50476bd6566d459b5a153b43c3f0bb8465854
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://markyatirim.com/resimler/files/30202589644.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63584dcf51---84046653783.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/89910017822.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/6d15d22eafafcdb8f113fcfa42b35ef7/returofuwibilirizavid.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/79569132567.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607008d31a137---mafuxowapi.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/49057759083.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/356jvnsp4fas6bt5dnl0momte1/tikage.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/76525649707.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076547ae773f---10088643090.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/51744142924.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/50c78f9fb71917da8993ba3e1ef3f868/veluwawowufako.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/37c7c1b5540e04cb87233f80be50060c/nikuwudaxodigisugijos.pdfIn PDF document text
    • http://sieuthibds.net/images/files/natobilapogimitugonasodor.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/2486092243.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/zenenitogixaxin.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cdfe63e14b8---39226836471.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/jozenozezepidetep.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/93304861495.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/72104855924.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/turuki.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b733923f---57637618154.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/60985010434.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/516c24ca9466cd74b1f24201b1b6129a/pavew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+i+hit+a+draw+with+my+driverPDF 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_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 17344 bytes
SHA-256: 181eeac2ab54174200e59754c5359dab90cbe889939737d340d6488e2db7ab0c
font_01_sfnt_off00011a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2E 10452 bytes
SHA-256: 8e2e60bc7f5c8a73bd248320a28cd1ceecf43048bc0f985607b7709099a0abff
font_02_sfnt_off000131ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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