Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cce596e4426cbd…

MALICIOUS

PDF

94.3 KB Created: 2021-08-04 13:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b3a8f35021c6787e11e1bc3510ab35e2 SHA-1: c1ba5723562df02a4105f48bd608a5472f0f4ab9 SHA-256: 44cce596e4426cbdc3343060e8ff3beef5fac659fb3eeec32afc1d01211d86d7
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the FormCraft plugin for file uploads. These URLs likely serve as a link farm to redirect users to malicious or phishing content, a common tactic for distributing malware or stealing credentials. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba3049bca4---98033365957.pdf In PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/funiwitaruvuro.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/45628092756.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/41175614528.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed464f9ab---jopipaponegekekek.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ep3eh4jhnadml1for252j5n066/37165805020.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/21668356417.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/vewobiragufevesafifarurog.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608446d1ba91d---55406845665.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/nefobakoraluvozak.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080298540dee---32958159010.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/20326187950.pdfIn PDF document text
    • https://primer-spb.ru/files/files/95555357921.pdfIn PDF document text
    • http://machin.kr/userData/board/file/79386118290.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b03e5565---92835768915.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/xubabosedivipejulixikofe.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/77agupmqp51geikqlcs53ngnq7/tuxusolepinusofuva.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930093d443b---78051682020.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/tedenojowusigape.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/82daf0e9afebdaf653b0ea31931fb1e3/sojigigolakizupitenalumul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sens+propre+sens+figur%C3%A9+cm2+dolomieuPDF 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_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 21308 bytes
SHA-256: 167132c66286254be56c21725112173cd9722d5af90df776733881c179e574aa
font_01_sfnt_off000137c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD7 11152 bytes
SHA-256: b5ba65fdd893dea0f2e6199f8d2f2e0560e8b4f27396cc2948d25870dc5758aa

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