Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3c972022933cca…

MALICIOUS

PDF

85.6 KB Created: 2021-09-21 07:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d59a4142706a62eed675fa45d6a4823 SHA-1: 1b43f50295a89004bbde1cf6e2c3cf7c38ef3fb0 SHA-256: 2f3c972022933ccae6c0d11ca273a9b7d0a90c03bbf2cacd533163845cfba37e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and numerous external links strongly imply an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136f230d601f---joxabegakaj.pdf In PDF document text
    • http://pscemetery.com/userfiles/file/5046786843.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/58387770500.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/85548052235.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/79175542479.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/jojiwugudemabizuxapev.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/62883240776.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/lelewavorumapikugom.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/zuxurofutadugufod.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109011917073650.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/wugakasezule.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/4140285268.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea2ea58be---buladonagab.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147dcb24745d---zuruxizegemotawivakef.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/91110037248.pdfIn PDF document text
    • http://planetamama.ru/files/file/49046506009.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b781336d6b---muvisosirujowejamisemuxij.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/83209490844.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/wivizezajegav.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/50989518012.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/81427416282.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd03047a18---68215469925.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/46026560893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=japandroids+post+nothingPDF 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_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 10484 bytes
SHA-256: a83e921f6a3bd39cc1588cada930cbbcd53feb2da7a031046f6e5ce3a4806394
font_01_sfnt_off0001018e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A0 18260 bytes
SHA-256: 351f634e6bf1d2ef6a28b0862953f39fc3ac0e6ea72e9045f71e601bab5c271b

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