Malicious PDF — malware analysis report

Static analysis result for SHA-256 decf4904be6006a7…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 19:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b4de776ce2775d0c5e49986bd59de49c SHA-1: 2680ec12b86c366d1e43f99e181e9daea50a7738 SHA-256: decf4904be6006a7ef1538b99b61cf998c799c7f1f223f70a428dca44a98006a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1190 Exploit Public-Facing Application

The sample is classified as malicious by ML and ClamAV, and exhibits characteristics of a credential phishing lure, specifically targeting multi-factor authentication or one-time codes. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a sophisticated phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://mi-stores.com/basketballtotaal/images/editor/file/87900481483.pdf In PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/63406977870.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f98af624---1055654996.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/fesuko.pdfIn PDF document text
    • http://spakimthi.com/upload/files/jafajonuwabeseledave.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/bikosokipifikugukaleviwu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/didipifidefulowuvileligaj.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tca2hcnkk6e89aath63vg2a10h/1026359647.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/966864612613633f9443c2.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/99025974169.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/wezadur.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/9jnkgvegihdpt16bi2q94rvb9d/kavavis.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/29173393753.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2191675f---29854914732.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/79731214146.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348e8cc5e0c---zelewenovoven.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/16072247694.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/31660156877.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/pasegivoka.pdfIn PDF document text
    • http://air-con.ru/upload/files/gamekoxu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133e8b7dc5c8---zipugop.pdfIn PDF document text
    • http://uhorder.com/upload/files/24693727810.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/susulunof.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/ravij.pdfIn PDF document text
    • http://scpt.it/userfiles/files/jetutekutuvota.pdfIn PDF document text
    • https://chilepools.com/contents/files/dotugexovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+download+android+apps+on+computerPDF 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_off0000cfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEB 17772 bytes
SHA-256: 2e0440d35ba7aef822ffa84632f38ba7707d60981409119c618404d574622b07
font_01_sfnt_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001162c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 10852 bytes
SHA-256: f401fe6ef69eeabb93c2a36a207e8eb5114e3e269acc3afd7cb4ee039410eba5