Malicious PDF — malware analysis report

Static analysis result for SHA-256 f294161379b55e25…

MALICIOUS

PDF

90.6 KB Created: 2021-09-18 04:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f771703d6da814e3f8e43c8d866ffb78 SHA-1: d7d53a98282a11a0d6308586294e68961280d495 SHA-256: f294161379b55e25713fc755177b3c79c1df159b17f03aa241c375b0b1607c9c
176 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external links and the overall structure point towards a tactic of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://garglob.ru/uplcv?utm_term=mobile+games+you+can+play+offline PDF link annotation
    • http://glampingcaravan.com/userfiles/file/20210909205037.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/naxavu.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/dbdff40e9b83f5c6757067421fc6ee66/12406668897.pdfIn PDF document text
    • http://kasand.com/userfiles/xafesoniganozisi.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/15460829807.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16144e590cabbe---pibuza.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/37246101781.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/baselapazaluxam.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/jozodutotebanuxagujone.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/mawazizedegonosub.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/36119172202.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/67733162260.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/towevotevuvatejenajebuwe.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210908_160710.pdfPDF link annotation
    • https://ms01bet.net/contents/files/xajugo.pdfIn PDF document text
    • http://dezis.ru/uploads/files/panan.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16144b76b5c9c4---tasixuloxirojidurixufem.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614515086eb56---sewunosojezojepujidokafe.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/29047470505.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/basuwojomej.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/41523804452.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413ee175952---81382102462.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_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 18240 bytes
SHA-256: 39032d99408e0c6c645d1804d4a12bead1120bc4181fa22ee0e01f9d42094d0e
font_01_sfnt_off00012baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAA 10972 bytes
SHA-256: 9d9650ff910da9fa10b3d27413f400affb59a19bb6592fcb3337aa00ee39903a
font_02_sfnt_off000144f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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