Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac83c3e8fc35161c…

MALICIOUS

PDF

86.4 KB Created: 2021-09-05 23:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e6900817043dbdf40e21c67397739214 SHA-1: f92edd7f5b137d14b64fdca83b81b06e5841cb1a SHA-256: ac83c3e8fc35161c218e0705a25be74705f574054ea989afef27925056bdb3a4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised or disposable hosting, indicating a link farm designed to direct users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://rsun.pro/admin/ckfinder/userfiles/files/6766578137.pdf In PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/bodoxugumaw.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f9e8b7d37f77d3e1c0130af3904aa6ac/26162233012.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/60945545875.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/bfc4cf52be57f9816cfd7af1cac75f93/70436980883.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/ratixuzan.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f40026e58---72099584132.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/tomimadikebipikejokalivu.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/funilezu.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608d666bb186a---famuvetakixuxub.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c28878b381---7025590789.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607749584ffde---16864115984.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210810051807128.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lre1t3c7sgohqkqk3lomdo1vlq/fafasojopud.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/diwofodonasagogakexe.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/713b12aee87606a2c799922623e0f9a4/daziwubesimavifiberibepul.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/26972749353.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/saleneti.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/35432753677.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/05c57eeb4ab980ed6908d344d20f595d/59708818669.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/mebedi.pdfIn PDF document text
    • http://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/29888707792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=convection+currents+worksheet+pdfPDF 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_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 18636 bytes
SHA-256: 72cd760d8e016f6c24208a8874a05d8fcaeaa72b88956e06e72623ca189507fb
font_01_sfnt_off00011b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B20 10884 bytes
SHA-256: 0a73cccc07e96ec06b2932d1caa830fb54b7d38f838206f359df0e80936ee525
font_02_sfnt_off00013463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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