Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd471ad12d04482…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 14:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31399d5a40348ec23e2dd197c0bc9b24 SHA-1: 37857306f7647d82362d82bfd855b024ded2bd4e SHA-256: dbd471ad12d044820cb99bec7fb4de6b6c4f876e4d3c02e7f823e2c99541890b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites. This suggests the PDF is designed to lure users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160878236ad343---2597984807.pdf In PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/b460a9d021227d01b520b9d8ccd7abf8/79742140634.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/dawolape.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16115ac580cef8---57019323525.pdfIn PDF document text
    • http://dr-temt.ru/images/file/73377373285.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/33412823480.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/61634982625.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/xuzinozefutejave.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f9d964e4d807dc4499950297adc82cbd/gatuk.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/mamewafimirenepuzapuxa.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/6e1c09c97e424ec4c6ab934472c2fa9f/22996517401.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/miwagejavexixode.pdfIn PDF document text
    • http://beiks.info/public/file/babomufuvupirus.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/xalomuridumudexowefuzo.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/oajtt47f4i7ns539644q1slhee/53286453182.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d70200744---rudatumetuz.pdfIn PDF document text
    • http://tianfonmm.com/d/files/veperovavinokomeja.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/11102794488.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c0d09cb69---tajikuvokerarudagomel.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/202c552cdb397143de2881dc12ff3a98/jeden.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/55377d1ba0c98a089921b1bbf1bde57a/61961017432.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afc667be9ce---ferekubifisabolufugezi.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16126e0fce4fa1---variruzixexuwonugil.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/25663561804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=converting+files+to+pdf+formatPDF 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_off0000caa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 17896 bytes
SHA-256: 820915d4e6a4f62e36a0efd2f5560415af6b3cacff97eb23c2e227c43fa92ae1
font_02_sfnt_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 10940 bytes
SHA-256: 75984be548984b8a498cfbe91eeaf11b7a36c6c57060e45d4368aeab29b24428

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