Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ab97f3618fe877…

MALICIOUS

PDF

92.0 KB Created: 2021-07-10 13:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acb9fa38d7912edd1958850f03e205fc SHA-1: 931c92bdcdb1ba75c66053903f82c016e24bd83d SHA-256: 61ab97f3618fe877ad476d36a933262885735f8c7561649291ea612bd12a946d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links strongly suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pelicanfinancialnetwork.com/ckfinder/userfiles/files/46695528978.pdf
    • https://cissud.com/uploads/ck_editor/files/rizuduboresutogaz.pdf
    • https://tresonance.org/uploadfiles/95569591699.pdf
    • http://hum-lucknow.org/test/fckeditor/file/17321225992.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073c2dcec887---lenogobaluximu.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160953c2ca0fa2---45748570472.pdf
    • http://dzbnf.com/upload/file///sidogix.pdf
    • https://edbcagliari.it/file/57298652638.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb2bed4d0---48421203319.pdf
    • http://www.allatpatikapecs.hu/images/file/28793424030.pdf
    • https://llsindia.in/FCKeditor/file/38798752099.pdf
    • http://superpart.com/files/49675631385.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/90003032744.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bce30863f---rilujofes.pdf
    • https://hzautomatisering.nl/userfiles/file/29013072233.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/68c28ba5b85b6ae1518a1dadb6c0636c/lawexijoj.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/tprjtc6597dqdih4a1q352cgp5/perelopavavaju.pdf
    • http://cesishotel.lv/res/wysiwyg/file/roxedulum.pdf
    • http://studiobaldizzone.com/userfiles/files/75332512903.pdf
    • http://global-insurance-broker.de/downloads/33033177861.pdf
    • http://candientushinko.com/images/file/81723880426.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fa441f5d---46544817464.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+ask+question+on+yahoo+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010746.bin
7e805c57ea9e175a1a5d66b7e27be323415758542567ea23e8b02e4302fe0eef
pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 16504 bytes
font_01_sfnt_off00013219.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13219 16792 bytes
font_02_sfnt_off00014a30.bin
4faf88edfbfa6174f8626ebce7cfc75927f745fc3cbc3a525750dcb4100a4ab4
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A30 10688 bytes