Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4152cb7088dc41…

MALICIOUS

PDF

80.1 KB Created: 2021-08-23 14:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 790399fcfbb83298c9fa9c87c98ed1fc SHA-1: de293fdd57d268f7a2d4ec2bdc737a827376c517 SHA-256: bf4152cb7088dc413a76062784817547e9722695c123cd2c4eb4a2e350c5b959
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=happy+new+year+to+you+too+in+spanish PDF link annotation
    • http://nceed.kr/pds/userfiles/files/20284958658.pdfIn PDF document text
    • http://charontrade.hu/data/file/34517237596.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/xuvogewox.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/99511605842.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/satasaloselewakudetilunek.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/2gq8f6h1qc9flqvp6egqib365h/tusoliz.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/tajifojozukad.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210816172709.pdfIn PDF document text
    • http://lscapital.it/images/file/62320856069.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e617608b9a8---41512285407.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099814cb103e---52519634640.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/bakanesegot.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/tajevibana.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae244e58a4---ginigoxovirotaz.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/larafufigakelogin.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/59341956945.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/kaginatekexuzoguka.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160724d4eb2712---vadazefopomumevowu.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/fipujoxubuluwufipuwaseji.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a09b33381ff---xezuzelijivipeja.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210516150827.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/nusuwosinunofetemigen.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/58656173197.pdfIn PDF document text
    • https://arerp.kr/data/file///6429018069.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_off0000d192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD192 10596 bytes
SHA-256: 307bd261276ab3ad08a53ca54d18d48fd4266016bd5496a24601990d66006ea0
font_01_sfnt_off0000e9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 18320 bytes
SHA-256: 9c76a6469f252e17637f146aa22dfda67eb3448f352edd2b343d9b7f476dfe54
font_02_sfnt_off000118ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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