Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89ecc3cc2240cd8…

MALICIOUS

PDF

70.4 KB Created: 2021-10-03 21:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ce2d4e54cb70f18eff41d6be10d92f3c SHA-1: c84fef4d0eea03827571eb5bfe96bb8e507ff246 SHA-256: f89ecc3cc2240cd8513675517897431925c6766ee4f0abb4503fa45c5791e99f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a link farm directing users to multiple external URLs, several of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable or compromised hosting further 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 http://eapver.com/upload/ckimg/files/202109100733171182.pdf In PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/qvhs6mhc24vedhc6ai5fnuvtdq/66060595979.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16146295da19c6---19888803005.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/69482923264.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/zamevezinisevufuwofevise.pdfIn PDF document text
    • http://www.bash.cl/media/file/fovepevadakijo.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/70425533529.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/jokafuzufemove.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/36015130854.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/mofasu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b04f7294bd---safevapev.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/wijoxuse.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/80616455384.pdfIn PDF document text
    • https://casaalu.com/luutru/files/pagevugeru.pdfIn PDF document text
    • https://buka.ru/sadm_files/wuvewagodasavoxalo.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/resanes.pdfIn PDF document text
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/80038658525.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/89687693260.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/39292141595.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/sulus.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/texijubegosirewasu.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/62295129095.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/sonumitunaguketuparev.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/86807653665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=neural+network+as+function+approximatorPDF 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_off0000b02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02C 16036 bytes
SHA-256: 04cd9cbf7384cf55b6eec2e89f1158acb994ebdff0a9f3df9e87512160af0146
font_01_sfnt_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 11000 bytes
SHA-256: 4b56817b32094286735f4133e616f9f010e7deba728af2427acc08c23909ff65
font_02_sfnt_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1