Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d16fcf4fe22225…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 22:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c85fcd0b3b28b3b3d9b4f6f7e4c2f4bf SHA-1: 2afe6351ea796151afa0b02968844ae87f76d945 SHA-256: 88d16fcf4fe22225a7740fdafbca3b070fbbbde20d7d73df0968316716a03993
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://pixomot.ru/uplcv?utm_term=american+association+of+colleges+of+nursing PDF link annotation
    • https://dimensioninteractive.com/WYSIWYGImage/file/26018389673.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/latokagozegamu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16129a34ec9ce2---sotusapawatuxobaj.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078ddbf0e42e---simafivobazelu.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/lubisalevogobugemapuli.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/85277723326.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b8d3d9a92---7924026873.pdfIn PDF document text
    • http://praguetransfer.com/files/file/30667794002.pdfIn PDF document text
    • http://fitviewer.biz/files/file/55317955052.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/rusomelunekulafujol.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/75154824093.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/fitil.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/444d085348b90bbf9a9e55c45076812d/44375617010.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/2440533711.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/a1hi1tipgc5iff13163n0npm31/vowezukajitu.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/37068185060.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/lodorefel.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4e4f1cc08---fawokadik.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092600140c88---madam.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/63486552293.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/jagoladuriramapanulud.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/7160td5fprovsjdn3su3h0ls94/98816734282.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/50253494722.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/19181304547.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/14838747810.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607001ccab369---99529295088.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_off0000e299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 10760 bytes
SHA-256: c8e85defe4f6321bd0e10c8cb6bd38d1c088c432554d2980377213f1d76e53ca
font_02_sfnt_off00011372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11372 17636 bytes
SHA-256: b70616daed14fd4659f0bbf4adfd6e2b2c81b6c45070a05c9c637c2b86ed9a80

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