Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78cba6eb54d07e9…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 09:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 959b5be46f1a66b489817add7dc09b0a SHA-1: a338bf26dd29188fe8314c1519a78aab0ddc4748 SHA-256: a78cba6eb54d07e9b2870508d6ed005bd8c7ba14b0878e2dfcaf1ddc6929c090
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, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sassyissy.com/survey/userfiles/files/jajebudi.pdf In PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797f23d9e67---pexowilowofoferajowatom.pdfIn PDF document text
    • http://jp-cable.com/d/files/7983742060.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/94a06d2681d54ce191c255609d6e4aef/75412510891.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/v83c4e689k010hck2jsjqi29uj/40604079640.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090e923899ed---moruxikuf.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083b8f3eef47---62984512807.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/tadof.pdfIn PDF document text
    • http://charontrade.hu/data/file/zofilonepiwonodofewira.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/58244211877.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee422e16b4---31406531056.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/94541427824.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/sifomus.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752aff4cc46---87904541472.pdfIn PDF document text
    • http://elitvorota.ru/f/file/gufexokiwa.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160803892c9228---17550966003.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991461397ad---14949316416.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/vewufuxijumu.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/deradur.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/22803068716.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/53949527229.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/23297441418.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/fidika.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5acbec5a84df1794a5ba8863145e1d20/47848848199.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/48719311120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=difference+between+congruent+and+similar+shapesPDF 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_off0000e568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 17448 bytes
SHA-256: 0c501f4526d2f6b076aa1fbcd1642acc5fee68ab0ac2f42bb92a1330042edc38
font_01_sfnt_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD6 11396 bytes
SHA-256: 8fe8a88431b29296b2b35b1868666a5152df12101f2c26d117719a6483cd43a9

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