Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c6f805e4674c56…

MALICIOUS

PDF

94.5 KB Created: 2021-08-13 09:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 47309a1cd6bd376a406d41dfc85f37e1 SHA-1: fee0e3d8ea6ba012cc69202a2abe430b837582d2 SHA-256: c0c6f805e4674c562d72ffc4f7e1860b5bb5721de6125b2a1b41a680c712b0b9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous links, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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 https://irlanc.ru/uplcv?utm_term=kingdom+rush+mod+apk+3.1 PDF link annotation
    • https://vishalahospitality.com/ckfinder/userfiles/files/86407551641.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/tavunega.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/498e6c34080e593221d91dbaef161fc2/44663276140.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/hjig7lkjkm1cudo6kbaflmqdcr/dabokowaxebufatogezer.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/latuxidiba.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/48746534621.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/2553635497.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085a8d58135d---kiliganiv.pdfIn PDF document text
    • https://mikludava.lt/images/files/dekalelonegepigik.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/disilawaxebepukaduro.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/80471693832.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/44505231434.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/tuwusokasekapepa.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/lelaliketaxugibofisezupar.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a6f30a7f96ab682950d397f3a45d971e/xabunupizuvudomosata.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/litujun.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/zupubusurukanuvodiximabov.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/53186806763.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/385122762.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bebdc514661---letekewazabazoki.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608362b548146---90280218362.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd188ca01c2---73705360083.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710091b151c---bufepavofule.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/58626284377.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/gijodulakaxaviladevu.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/gumoraledonofogavu.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/72966219286.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000efc8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEFC8 18000 bytes
SHA-256: 8fba7da54e65fdfd0738505790655694c23f9a44b5c9ee2d8af7bae742ca57cc
font_01_sfnt_off00010bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 17704 bytes
SHA-256: 11ba1c37caf98402a4f70f0343a38fb9846a1dc2323a787a9943c51dcaf79c97
font_02_sfnt_off00013a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15277 11036 bytes
SHA-256: 776b49a4991fce7d8af18aca428a28dde82a207ae2bc924de29acc360db35c3d

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