Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f4c9e9561589c3…

MALICIOUS

PDF

72.7 KB Created: 2021-09-24 09:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4b4e96c791b104a8c83ab257ce795f8c SHA-1: 851daea774ec52c1609c600ee4a689fe0b0664ab SHA-256: e2f4c9e9561589c3d4a07e8f616cc38fa1521f28ef7c131927bfab0da7f21f52
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://servmed.net/userfiles/file/18261320054.pdf In PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/3557444753.pdfIn PDF document text
    • http://ed-union05.ru/files/file/negiledogojas.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/limejiron.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/nezusovolaridokiwakezam.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/funorezakowixogamor.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16131bad6b53c4---jipuzisipo.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/zugiwoporemelewidipa.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/34673008341.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/sugen.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4891a4a92---42042463544.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/vomav.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/12338737647.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/74057752098.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/14036462542.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/79098994519.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339d83326d7---zebaduxapisil.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc172d35a---lufebuwineruxubalopigose.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/958198212.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410fcbdce72---69926823172.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/95951569480.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/27475121452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+the+conjuring+freePDF 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_off0000b7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B3 10624 bytes
SHA-256: 8e479e27effefcb6d89a9a44fe0b8b64dce226212767d0627fa154b8d0c9bb1d
font_01_sfnt_off0000cff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 17404 bytes
SHA-256: b493d99d52d9a4ee268af465b8a44bf6ef8856493584bdc4ae40b8fc0fd9111e

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