Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a79f5f14f0f68e4…

MALICIOUS

PDF

74.1 KB Created: 2021-09-20 17:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5255daf3f36e17e375e6bdebec2c8f9a SHA-1: b85070250446cbe54a00dfeab395adb0048fb497 SHA-256: 3a79f5f14f0f68e48bf3ce3d1ec9ca72bfefbe1012637277891e80c9d03baff1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mwcapital.net/ckfinder/userfiles/files/puxofojolowini.pdf In PDF document text
    • http://www.colormotion.cz/UserFiles/file/54806256074.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/oeth22q2010645m0i301og0dug/wipepupefitadoropokix.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c36729b1b4a387e89f87fb153ad000c3/14398078458.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614080f8de068---pupizotiw.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/wiwadabofukexisopa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5a937fbc6---27670732168.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/zigaxaxojitagiwobudewi.pdfIn PDF document text
    • https://5uempat.com/contents/files/nuvurekevas.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/newifelidoboradofu.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/dulemo.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/tevonanebup.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/27379843324.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/94774499175.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/jovemakuxudifobafudikilu.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/32252590145.pdfIn PDF document text
    • https://yellowstonewildlife.com/nezoro.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/wobaxazivuzijip.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/sawobadiwodoxujib.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/kixepuvemizupuzodo.pdfIn PDF document text
    • https://virker-ikke.dk/files/43382621655.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/59957052792.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/74405582523.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/53018699720.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///sevigipevojulusijavud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=principles+of+economics+mankiw+6th+edition+pdfPDF 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_off0000be7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD693 11232 bytes
SHA-256: 8c9756d2e097598c64b402613f1e09fa7f6196ad2629a01e53c8a73d361a302e
font_02_sfnt_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 16064 bytes
SHA-256: 3e07997ea6ad274211627d93aa0193a673ac08e9575787e5d6aaee58d4e07c6c

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