Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be838663b2173bf…

MALICIOUS

PDF

77.3 KB Created: 2021-09-22 11:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 90e0bd0c40b0ea92e62721d93b117523 SHA-1: a401c92e86ec946b035f8d19c263e466f8330c05 SHA-256: 3be838663b2173bffe3e4300a5bcd41b7d9e0ee6eb0917125378b1bc205ad8ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to other PDF files hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://huntic.ru/uplcv?utm_term=gangstar+vegas+ppsspp+game+download PDF link annotation
    • https://altonika.pro/files/fck/file/81790638036.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/komud.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/wibudatozum.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/6010630135.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140919a60534---47434573727.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/59353719412.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/lafemekobibaf.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/70298459654.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/35284921065.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/jubeximijuxod.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/gemedekabomutewofazunikez.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/74808603846.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/15934840195.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/raxowe.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140be4ff41f9---batudadumaxiwuku.pdfIn PDF document text
    • http://dmkert.hu/files/file/53050852398.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/89090605602.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16143073c8d4c6---49707864341.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/61357430087.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142ba345e07d---moven.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/lobepeloxowawutomalebire.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/58038846859.pdfIn PDF document text
    • https://nexusmediation.nl/files/98282237802.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202191678353581.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/63389062481.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_off0000c94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE166 10832 bytes
SHA-256: 479fe4c1ac3fdd56f3688794f77da68b8e11ded682b40659ed5736728bd54060
font_02_sfnt_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 17404 bytes
SHA-256: 34248da849e8d275265174a236dba2d45e63aed3ab97a63877b8e4ea15ddc374

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