Malicious PDF — malware analysis report

Static analysis result for SHA-256 496e9f8309ba98c1…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 23:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec292fae26b6e7f4297e265152797e34 SHA-1: f9a4722df47a70625b2a188d9a89658dd145f29d SHA-256: 496e9f8309ba98c1b9eb38381efd93f55a5048eb32411937fd64e236a9172f8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://secretinvitation.net/images/files/31716608503.pdf In PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/zeferolumonifafewi.pdfIn PDF document text
    • https://123natura.com/stockages/files/79098959474.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/delebetidowuga.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/90aa92886285379e802bc7cb7dd66f34/numajitolegonapixanipurin.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846144eee6b---nixolubiwanuzifikeratuwit.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1decaa0f9---13099082309.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/34157006495.pdfIn PDF document text
    • http://devison-matras.com/upload/file/15176731281.pdfIn PDF document text
    • http://thegioioto.store/upload/files/kajaferanugugu.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/punuzofin.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074884ba90da---16099403000.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/45564707827.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/j6o1q7f1e4grquldb2onp2d8k7/bokakos.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/64108604836.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f7724558c91---61546428018.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfa5e2dc33---11205716972.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/zokodu.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6e658e268c22cd49a5a5c9f468192b26/jujapidevojaxizukigadajo.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/kirotafo.pdfIn PDF document text
    • https://eclearusa.com/images/file/xomiga.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/38493604932.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/zerid.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/59aeb20c6fd07f01e6b293c056d25693/xevatebuvizudanotu.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/6jg7jhv7dto3672c65da46b8k5/satilowipikadufewimigijot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=karcher+k550m+manualPDF 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_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 10456 bytes
SHA-256: 8077df04a560189f7d169cf6ed12f5fe23e87f92aee76213e6d6d8cbc24c4083
font_01_sfnt_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 16708 bytes
SHA-256: eececcf36de5d43d0f4b3397b4987e8f2b4a81576a25ecc1ba1c0f88f7f0f0a2
font_02_sfnt_off00011646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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