Malicious PDF — malware analysis report

Static analysis result for SHA-256 58602e193da75351…

MALICIOUS

PDF

81.5 KB Created: 2021-07-01 00:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 820fe7e7b31ae0e7d8fe3399afe840da SHA-1: ac4fcbe139e470bd446e2ef96d89d1697f62a8ef SHA-256: 58602e193da75351bbea2b75da3584a3b4f1b2e86262d59db4231cfed76d5054
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a chain of redirection likely intended for phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/83adcb185f8702a2294675cf2846cae2/kenojir.pdf In PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c331435c61c7a0cb04cb4c805794cca/miwatedexuzutanidam.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/37243531016.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a850213009---17402938690.pdfIn PDF document text
    • https://tangente-mag.com/img/file/1930550754.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/fvk923epdb2sv6429o815ek0t7/4502982495.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/mewujonejijeriki.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/b1dff920777a30f9686e2c1ce53715fc/lasiwafefidonopepokivudar.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc591e9bf---bilogavajorovafizojareko.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a9be5233---womeve.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f91a2e2d14---92200413194.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/fegisebojibabilume.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/venuluzawawola.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/20930341274.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/62496056809.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcff79aa11---22852254282.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/jejugobejavipo.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/xafuwejamanulidifu.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/64465bedeab7e0c47db9978f1df61787/zekinixabekibasi.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/pojewofobefetexatiti.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/90330444096.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d449c1d28c---podutuledopeg.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d77f5a436fc---41643889601.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/niwomenub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=i+can+t+tell+you+whyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC670 16228 bytes
SHA-256: 11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f
font_01_sfnt_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 10220 bytes
SHA-256: 696b426ce5c3e10485a225525ca54aeb3c167b0a69ad6902637a17a9b9464471
font_03_sfnt_off00010b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 16648 bytes
SHA-256: fae93e32fbcd7420aa7b8950ff3a1d093e2919c561276c2d132268a1fc41e404

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