Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff03196b1e68ea9f…

MALICIOUS

PDF

87.8 KB Created: 2021-09-15 09:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f91d7b3f9745e353fb4ed26df1af6011 SHA-1: ef7bf0d81952e77993351cf6b613c678dc56f67d SHA-256: ff03196b1e68ea9f143313f1efc4758c67b2de6e212b51e427eb8068e55ae645
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to potentially compromised WordPress sites and other disposable hosting domains. The presence of a 'Password-protected archive handoff' heuristic suggests a common tactic to bypass gateway scanning by encrypting a payload, which is then decrypted using a password provided within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://garglob.ru/uplcv?utm_term=how+to+turn+off+double+tap+android PDF link annotation
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/35484983242.pdfIn PDF document text
    • http://generoussecurity.com/uploads/susizebefalakutoj.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/62677446259.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b65137be---4171158487.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/xidixenunev.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/wikuvex.pdfIn PDF document text
    • https://sapporopools.com/contents/files/35398136635.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/lapimazupuretitux.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161414198e581f---gerezaw.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/19532840706.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/15505072778.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/komenikurubifo.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/marurixizu.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/dafoliruwulikuvin.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/47202655837.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/galopuwupobevonaf.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/48276679894.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/15593866883.pdfIn PDF document text
    • http://wernitznigg.at/files/letiziwelivovusugemevu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613edebdeb2f9---dusibuwekugok.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/13158683083.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/60399118968.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/21844990088.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_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 18376 bytes
SHA-256: 6dcb6b6b0d7d8387b9475c43e7715bd8a47b8c133c53d4ceeb3fc736524637df
font_01_sfnt_off00012145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 10640 bytes
SHA-256: d21086e304d13cf7b1bf8a997b6cc8e03bcadf0e402b2a547194339c2a474b94
font_02_sfnt_off00013977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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