Malicious PDF — malware analysis report

Static analysis result for SHA-256 af045dc90a97567d…

MALICIOUS

PDF

78.4 KB Created: 2021-09-12 03:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb666b55bf6863659af8516f8d123058 SHA-1: 7f35fd0e53ca972ae15b1e4405757e9da94f3d63 SHA-256: af045dc90a97567d425f96601e5f5083c2ced0d8127394e8e23cc89a78ea6ef4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of multiple external URIs and link farms on potentially compromised or disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=emulated+folder+android PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4j1le5obigftt85b4hs7k41612/82450058770.pdfIn PDF document text
    • https://bunianco.com/other_files/File/57012055884.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/razawa.pdfIn PDF document text
    • http://uteambio.com/upload/files/94129072783.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/30469132952.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/37912125168.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcd0f5059e---rapujidiwowejibugi.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/4978688517.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/24990438341.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613694f36f279---farepufegoj.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/73106546615.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/labezerosinibum.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/48806316960.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/jalomiror.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/44356374590.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/xaserosapan.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/40192779274.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/11966415505.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/sutudi.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/xididopevijajo.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/tuvirijovivije.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/madozute.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_off0000caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 19028 bytes
SHA-256: aed1724983e28f21b8c5e448363d14315d2fef087ba9d2cea3df71a5af449910
font_01_sfnt_off0000fcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 10428 bytes
SHA-256: bbf2daf13492703bc7b49621b87065c745f211dbac63b3f749dcfd40f5ed26db
font_02_sfnt_off00011443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1