Malicious PDF — malware analysis report

Static analysis result for SHA-256 4944cd348b087116…

MALICIOUS

PDF

108.0 KB Created: 2021-07-07 05:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8243c59e0f52e8f0ab30795767a5584d SHA-1: c18a821782380ae478124dcefaab8961bfc16e7e SHA-256: 4944cd348b087116c9ed3bfe65d6a4770825ec08e0332c772b691f5a22c3a277
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://catamma.ru/uplcv?utm_term=multiple+linear+regression PDF link annotation
    • https://ytdrive.com/CKEdit/upload/files/zatebepolukubekadu.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3cea244f0c0c52138e24286eb925b60d/zibati.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/7a43e15c98d994e7e1b46f8c12fc1405/86861525722.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160987611bc7d6---54619676979.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/jafuliwetipujeg.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/39791942757.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210619221457.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d802fe091434bf65db48f5fc1aead7ee/87383691766.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160876c4c01b37---97256364709.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/zexum.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/24018559132.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/291525685440420de974842a5f0d9f2e/pokiketumixigevu.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/016295d5727d82a0b110d1734225a597/pivagipuralug.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca02e2c9f8---fegumodujonekesoradedoj.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/29248763669.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/32578868865a2953bd2e61e0af4dde12/57170253309.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/49160a37f64e4179f72e02795ec709a6/67302374860.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/12/bamefopo.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/c3c6g1l8fkb37s0ucg61ggltn3/dubufodo.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210620_5CAAA1480FA147DF.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081a8a5e55e2---xalajesageveradurupelamif.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/31d2523356012db1f4b8d39be7f5c7d4/paperazavotijevibume.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14074 10520 bytes
SHA-256: 97fe88b97b5f98dd62779421b204df044679e6cda6118563deefe2b93f1c68dd
font_01_sfnt_off00015883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15883 18196 bytes
SHA-256: 6b6ec0fe3c83058e2d73a79b2d39a0bcee8a257e9cb7ce0f6d0d831048728c6a
font_02_sfnt_off00018914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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