Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cafd3616a36fe28…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 06:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c95132f5b153b172c824a30ff8d4694 SHA-1: a7a4f7f11160663bf8b3cb5ed00ffbcb5969a11e SHA-256: 3cafd3616a36fe28c51f5a1d18e1568e83a7f34cae72c5e99c57bf11af39e65a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to various compromised websites and potentially malicious PDF files, disguised as a software project management book download. The presence of multiple external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=software+project+management+pdf+book+download PDF link annotation
    • http://www.findvoters.com/userfiles/file/34456974830.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ede890c4ca2---nugerojetexape.pdfIn PDF document text
    • http://markone-tools.com/upload/files/pewetojokivuxokosutapezoj.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/9307a3fc42f4ae39ea3585f7dd8b11b7/98543269226.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/13823390197.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2c64a54d3---99934714012.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/19000149320.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/zewukifefetine.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/eb81ef9fd6cf1162abf61c2e47c544c6/gajokon.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/18173126853.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608604a6a661f---jinekodugeporupuxubexifu.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-28/images/files/nuvupajij.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/nifafoxamibuna.pdfIn PDF document text
    • https://jotelek.hu/files/file/wisorojigifimiwaxizeto.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/retotozona.pdfIn PDF document text
    • http://dakmet.pl/upload/xijozujerezudebifokiwoxaj.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/kukurikime.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sokawemumubafi.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071d9f697ece---10083487287.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160850d68d44c6---5268639885.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/32ef14dc1fd2d6558ff3a1c9448afc25/63140097744.pdfIn PDF document text
    • http://charontrade.hu/data/file/19815411660.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/84959435104.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_off0000de3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3E 17044 bytes
SHA-256: 65792482af7726f55b8a8914aa4fd2c1faab404fb3575c0484ed84a6e916d38d
font_01_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 11228 bytes
SHA-256: d7d1b04523ee5e186e0e3247230c09773785a9d2d9dc880e0b698b5b787a119f

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