Malicious PDF — malware analysis report

Static analysis result for SHA-256 c387bc36cfef1b5a…

MALICIOUS

PDF

101.7 KB Created: 2021-08-08 11:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 355f9c8b9b36fa3b1f1f7038e63fe7e3 SHA-1: 5b50395790c92960cf076d133fb0379308d9c5fd SHA-256: c387bc36cfef1b5a3adf79a6ca15629f2b2bd80812d5c6383c947aec58119cf5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a tactic to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/648e1618dce4f3f4c25ae45e4aee0b0a/9125172259.pdf In PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e832c869d---72656836065.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/pozesixoxeze.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/bapenutidusixaram.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608003c392d01---91031119307.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/vopavakifakudukajeg.pdfIn PDF document text
    • http://toroisg.com/public/images/files/kobexanuvewesa.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202171074291230.pdfIn PDF document text
    • http://gloria-eurex.com/41985277104.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/1a5799398548a5eccf97350bb86d239b/vawivoxawegixinuwudoled.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160776df7913f6---galapubor.pdfIn PDF document text
    • https://dacola.com/upload/files/migekafegosepumu.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/riwokarilekoneburuza.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/qft856dm7srmsjria9o4bnl6d2/ritalirosuz.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d276052fe81a9445811393cb982201d2/22871647215.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/t2ruj8gk5l2aauea3sdgqmupra/63426544304.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/81994745104.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/73604201479.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28489ad4b---84091822551.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/dibuzekokagikoxuruwos.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160847e8556e42---61924997449.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/nudozefukado.pdfIn PDF document text
    • http://ecole.ru/text/images/file/9300394611.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3412057dd---bozujugesabenad.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/28027300113.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/dolekotumekonuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+do+you+eat+on+the+obesity+code+dietPDF 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_off00012724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12724 17760 bytes
SHA-256: 0703a2d45cd9431f8766ccdecedf595144d75bf471ba72933a670184e1e51b37
font_01_sfnt_off000155d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D2 10668 bytes
SHA-256: fba5d14cd5e6d35c9fb9dce18296327e156b70d02dda66d47e4308f97da5ecc1
font_02_sfnt_off00016e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1