Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2d68eafff46268…

MALICIOUS

PDF

88.3 KB Created: 2021-09-21 16:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 74694376c9fb08209723bba0d8baa51c SHA-1: ddc8b12cda5223c31d623080ef1677d8a7a2b687 SHA-256: df2d68eafff4626842f2c5bbf73bcc8fa79731fa189c2374b7b71338f6fff629
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised CMS uploads or disposable domains. This behavior is indicative of a phishing or malware distribution attempt, as suggested by the ClamAV detection and ML classifier flagging it as malicious. No scripts were extracted, and the document body was unreadable, but the URL structure strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://detaycopymatbaa.com/userfiles/file/kugejidumajikidegika.pdf In PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/kusemiduvediwulubasigajin.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/6692297982.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/96898550983.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65620629610.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/3vf6a120nn16fb4m1i9mmtt1te/fijekonozaxez.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/tefefexixepuguwopomuj.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614720adc0ef6---zikujewubosojazuvi.pdfIn PDF document text
    • http://drironcat.com/images/file/sufuvafaninexeli.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/4387570840.pdfIn PDF document text
    • http://autovoda.ru/upload/files/naburipivikeno.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/97681830272.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210906155049.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/femefozibopejemuganuvuju.pdfIn PDF document text
    • https://successalpha.team/upload/files/5999981600.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/zafuvokomovitilemes.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/surovizomoxe.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/bekozizuzenifedunuto.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/gafidalukuketamiwulopin.pdfIn PDF document text
    • http://rilta.net/userfiles/files/46178406328.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/kivezebibevumerezop.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/51923370131.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/funumibi.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/54229030702.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/94f74d1614ca5df821c230fbd75485f3/41683813766.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/22608762457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+android+app+for+measuring+walking+distancePDF 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_off0000f2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 11292 bytes
SHA-256: 8cfbc44c0be2853f411bf6bc4f53cad3838223959b5ff5c475172d0ba3a65faf
font_01_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 17616 bytes
SHA-256: 346a2f571a2b15b8422125c2f8951f0f886f81be774d0a99dae41c8c24b0bd5b
font_02_sfnt_off00013ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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