Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b9eed0409b0831…

MALICIOUS

PDF

76.0 KB Created: 2021-06-08 22:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 22644f647c3a809021b44cfa520dc582 SHA-1: 5af5220a751f6502713d7b7b5838ed34647f2c6c SHA-256: d9b9eed0409b0831fde4682009d88122625d130bfa27c4f6c44ca4af0d907ed7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to drive traffic to potentially malicious sites. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=mov+file+to+mp4+free PDF link annotation
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b48925842e7---34023753020.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088aac5261a9---59453199927.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2a03e48fde489d1747507a6f229d0f8c/mamidagepunuma.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/886264869.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b07b910b65f3072f63ec9ceb0229b1ce/gesiduzet.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/8667307862.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/liwijodi.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5e990f760---lofonenezumixepe.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/jemam.pdfIn PDF document text
    • http://www.centralperdana.com/file/21832063245.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/rufaninujadiluwoluvogom.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/698eb2e5fc997eff9adce79b3c57b5a7/xalodizurokuraxedekave.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160777b97ab8bf---tawejokoxikakewajubarulub.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084d29cc8129---ziveritefafize.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3870930jsuovguug49dr2if4s1/dojibixujususedukuwovaw.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/15780578727.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/24323232090.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE133 4496 bytes
SHA-256: 60911403abb5609206bfba76a37cb23698fc3cffe107bcfa675d8a909a30b833
font_01_sfnt_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 10748 bytes
SHA-256: 988882c11d176e8991e01cfeda7c37ad872dfbf8df9d2920944e1e86eb3dfab0
font_02_sfnt_off00011511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11511 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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