Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb3aa802848dfcc…

MALICIOUS

PDF

83.3 KB Created: 2021-08-04 20:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b0bf252d0c3c68e34e7ba78527b2491 SHA-1: 46498acda18d939e79df8d41de88d63a5125f53b SHA-256: bdb3aa802848dfcca6a1ee56efe2b5c1b1eda68fb33c5fc66e2c1f4e30b87d07
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URI patterns are consistent with exploitation techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=asterix+comics+pdf+deutsch PDF link annotation
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa58d1cb651---4487367001.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/xukajidowe.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/91050725757.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/lonufumaf.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/88271822411.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/dikexunefogisugomub.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ee52bcd9c8f9adc61eba72ac5546f8be/jofubozotosogivawoteluwol.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/85981241726.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3f707a9b5a3e11494b626648f3ed3eac/tujijokimoxediwunugoto.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/gf221912745npfms0ik25oou5c/91709341316.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/16555028058.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078bd62e0a68---gufazobal.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7hecpn3t228uud6gh9pv2s7qq2/gulafalafamezifaxulus.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/26238570120.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/surofijur.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/387775604bf08a09797dbe6c41dc1d93/depaweboxoju.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/8fa6ab5b0e61d1d5742e495c0b5df7e2/gobak.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/afd9tqorr5tu0cstgbvm4pndd5/46147930671.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/76999575314.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/23980147461.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/30786469493.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/dmh7i5i9mf9pgh3664usmo3d22/gipog.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/94602657891.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_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 10756 bytes
SHA-256: 194b12a7304fb2ba53f6b2e6a544ce41da0d1704a727a32db319b613b24fbada
font_01_sfnt_off0000f9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 17448 bytes
SHA-256: 5ef5c61f2d1651ac0a8d87edd9e357ea2ee3ce21eb127e42a086f18a35a7cd0e
font_02_sfnt_off000125f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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