Malicious PDF — malware analysis report

Static analysis result for SHA-256 987c659affdc1f92…

MALICIOUS

PDF

72.8 KB Created: 2021-06-13 11:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb67ce525b9451c7f61d0a07086ed8a1 SHA-1: 14f7bddad3fa67b6ab31f5df2701c39617684030 SHA-256: 987c659affdc1f92b38d2030a7ae5aa8d72de760e31f1957278ec6a33ab136d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://drafthe.ru/uplcv?utm_term=addition+worksheet+for+ukg
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160723dd2a1ea4---rusutu.pdf
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/60973578519.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5775547672---10556403928.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/21517453882.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59a54efb33---36620324807.pdf
    • https://tavio.ru/files/file/23926513737.pdf
    • http://travelport.pl/userfiles//file/fobidoruwojalena.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/addcc3555217599e6343582c7b3dbeed/94067959146.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/zuwudejuno.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/0ed16632526f2d800e58f6a76685bb28/rupufujikuruvuni.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c31f86c5e9e---29234897022.pdf
    • http://angarakshaksecurity.com/userfiles/file/6085751012.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4j961hngfsre1e0i517hb40n45/17682678857.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/72887688275.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/03gvp0t5bu5uj6jtm7cnbi0d84/benolonadadojefokuzur.pdf
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/85245148238.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e272.bin
332951daa46aa58038e32784434e1569d5f785f6ff6d2cc995eeb9f714e16830		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 5072 bytes
font_01_sfnt_off0000f3cc.bin
99b95da462620bb2a1dbd810a390d0755dbff1a320d6d4302258d467cfe6edbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 10180 bytes

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