Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6e047f3edf4972…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 20:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5b42898c1e873fd57bed2d6e5283d8bc SHA-1: 01b2250f3e34bf2cc5201732103272d41f7fa3bb SHA-256: 0f6e047f3edf4972fcac6d8b9e4f20caf7991e600eaf4883b1fb5eb8ba438e0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to what appear to be compromised or disposable hosting sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites, often initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=causes+of+trismus+after+extraction PDF link annotation
    • https://5uempat.com/contents/files/vekumutevobajojuvorigis.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/56151051794.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/30814839438.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/welimirafamujaguwu.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/keraxewumabuvoximoz.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161323c603b414---46499110625.pdfIn PDF document text
    • http://korytnica.net/data/files/gizejewelejopamapevo.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/93520617242.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161422e3c75132---renobakiro.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1632450610.pdfIn PDF document text
    • https://onlinendttraining.com/files/nagerilexuxufo.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/20948163082.pdfIn PDF document text
    • http://dc-a50e0b1dcb2e.breakthrough-nutrition.com/userfiles/files/82713198361.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/petizifufosemokox.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/r1tn6o61i571jld4os6uinancf/10255146851.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/69135778643.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/33829232325.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/34510177145.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/lorutufejo.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/luvineturenekadesivabiti.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/66749114669.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/filofazuxo.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_off0000ad4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4E 17168 bytes
SHA-256: 03465b54527afcd5dc6294c22005858ec4c66b4fb3d188dda5b8a22bd72624af
font_01_sfnt_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 10684 bytes
SHA-256: 89d113fbceb52fdf8e803ec42b3162971ef3a908869addd14e157d861538cce2
font_02_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1