Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd186f87aed4566…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 18:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 380f76d2b6d7b442f4d7b84b5cd931ca SHA-1: 434d71d68f69979cd77fb9c0e9f8abd8580584c7 SHA-256: 4cd186f87aed4566300cde97a77f4105583b1dd7833f65662cdbe0df38ca2e90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://archism.ru/uplcv?utm_term=objectifs+de+d%C3%A9veloppement+durable+des+nations+unies+pdf PDF link annotation
    • https://baxsporthorses.com/userfiles/file/bavupigugelojajasu.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/timemokulimodo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24ec32e36---pokopubixenosujunikuwip.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/panuxu.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/96323618854.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/12984241127.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/kuwalawafipanefovuduk.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/sevunuvu.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/7153822593.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/dijarimuvosikozuf.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202108152359444467.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/titaripifikopujok.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/87512748666.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160974d8001776---16058226666.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/84153072565.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/0g90h8qc46e0igig7ppc4v0d9v/19614055550.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079745aeac81---2239767261.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/25140333937.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f8189488b49378fdd3a8a7caaba0d766/17159876503.pdfIn PDF document text
    • http://industrialdevices.in/uploads/50450034781.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/53480617289.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fdb1b294c---wigojirib.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-19/20210819140523571642.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2a5c891d---wenokepemojovo.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_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 18564 bytes
SHA-256: 07066857d5565da290461ed5637db02b500c2cc5c455b417581d41808db3a518
font_01_sfnt_off00010ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 11396 bytes
SHA-256: 25cfd80051776650f4c69776d4825d2c1be9e8e3f6827bcaff00c0cfdb10321f

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