Malicious PDF — malware analysis report

Static analysis result for SHA-256 bceed56491d2e04d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 22:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2173ee48ea2c027c61eb13e80bfd79de SHA-1: 003f55aaca8935f2fa05f6c473c6e129a86803a6 SHA-256: bceed56491d2e04da9ea341b5e08c8141d91a29154e75c360ad55be3e81494ca
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=android+leave+group+text PDF link annotation
    • http://myredm.ru/uploads/file/71982204187.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/54944787514.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee9ea31e9d---46847126554.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/lezoxapuna.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/21342399934.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb400abc58e33be264081cbc0b3688e4/78107287521.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/41173816520.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/85618154543.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/sobinosemowuxasub.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/07332792096df1b5228ebc75ed93971d/kovemetunabesoxebinusu.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/jusilasorevuwe.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/nirijafuxibajalesal.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139b5faa2777---wefegilozodamoti.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/jowojomabelesuwivota.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/jokubidufezisamemarofesol.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/pijidotixerogas.pdfIn PDF document text
    • http://tai-group.com/upload/files/wilovitipe.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/domibadofiwetexum.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/10489140296.pdfIn PDF document text
    • http://elpijisystem.com/file/wijetizepokesefud.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/bologijibet.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/97245888140.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/nexitukavitexasaduko.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/viwarugawimavogujot.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/pexivudejopulewufupisevu.pdfIn PDF document text
    • 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_off0000b514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB514 10648 bytes
SHA-256: e1f54bae4ff2ce92edc3b6dca7fa660e21e073688ae43d665f6b970b1bf029ed
font_01_sfnt_off0000cd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD58 15272 bytes
SHA-256: 7ae2f2534e636a6234e1bf37df1da9da01db8f1e8a2137ff4077df3a7d64b6fb
font_02_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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