Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb3ce0506a85254…

MALICIOUS

PDF

76.9 KB Created: 2021-06-14 08:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f218e8470127215747a7cdcbe6de9001 SHA-1: 3c611a11d4bdfdb00eddc1ca5be25a0f647684d6 SHA-256: 0bb3ce0506a85254f93e2f23a06736c2effede624950c6803514254e0e423e97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://crysiq.ru/uplcv?utm_term=solution+manual+cengel+thermodynamics PDF link annotation
    • http://baugeraeteverleih.de/benutzerdateien/jagubuvivojirejidab.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/5d0e2037a875a3836bcf78b128f018dd/kusejibasavok.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/g6jabf8k16tfo7kcjgahr4of4h/91939832782.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bed4ca54e---99049352367.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607226baad5b2---xakimexerak.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073e32977088---lafamuvekisexijilujirovat.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a713734350e---21741457860.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/aff9d9850ad0ee042bcf49c7d2fa48a1/93351171919.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/20056352175.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/3202fr1vjfdv2l4dmbcep9cf07/tuginuvofizevubor.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/9d5e3c48554402b284c4c37c78f2e65b/pufojozo.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/s1bam47oarnahfc4cdahaeec23/16062416484.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/kazirokajunezif.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160909d122f80b---kosoripomixivovu.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/47934846107.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/15480325581.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/nmr9ggng4chbb3je22iqb91tk1/resapokopajolalom.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/87515260827.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 5560 bytes
SHA-256: 69ecd474cff8d12d17d08a3ce6596854d9213c4ef5c2728cc344176d86e02eb8
font_01_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 12212 bytes
SHA-256: d6605d0131d9f275739d886006068cd6610b31a06b0c625312563dd1d5ffd4bb