Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae21ac8252d1b745…

MALICIOUS

PDF

90.3 KB Created: 2021-09-02 04:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8de13fc4aeaa5cbc07e4ea1bcd7bf9b5 SHA-1: 7282d661c7919564d2b7ae8c56243a9affdda603 SHA-256: ae21ac8252d1b745795502a887c647ac0033d19f620a266699f62bb6b79bb59d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to files hosted on compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing campaigns. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098612d41464---50787763169.pdf
    • https://phoenixturkey.com/upload/ckfinder/files/luvatudem.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f3ba4e4ecf0f615e19938c4a445e57c0/latadabikagowufelep.pdf
    • https://bestcoloringpages.com/userfiles/file/gesajojakutaruzo.pdf
    • http://okzawidow.pl/img/upload/files/pomukevagarokamor.pdf
    • https://miguktour.com/FileData/ckfinder/files/20210819_071A00236370F305.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db81cdf2227---sililadada.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/a49fcca9a5c065b14061e6443fe151ea/91866190290.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c7ca9f881---16416476481.pdf
    • https://nabijdefossa.nl/upload/files/12127640839.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/36624915082.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2dda83631---20924195612.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/m5g0vb0jcu26lvte9v739ad0pn/70865037387.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/83ebf560e6963688e64df90cf8dfd3a6/gikinigibomevipes.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/f5qe8rkg1seig8utfn7fhiur57/25830410247.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3deec16f1eb63b586a9ad90e1b9f2486/fodenorofazo.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/1c16bce1e58806e5cccbccda8b72435b/18615754256.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/dd33e93df4545e82934dc71b8f3d9b06/52019901688.pdf
    • http://vimbark.sk/editor_uploads/files/sodokaxujud.pdf
    • http://elite-nails.pl/Upload/file/12949183958.pdf
    • http://buyo-g.net/userfiles/file/98155229966.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d694921e154---72741957355.pdf
    • http://cedule-plachty.cz/files/file/narulomutaguwew.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fishing+guide+osrs+p2p
    • 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_off0000fc5f.bin
3d1dd1e24abe3240d391cd3c3e7c62db6af7e3cb2dcc4304cfc22f03b7e8bfc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 18236 bytes
font_01_sfnt_off00012bac.bin
65d2d7a6e1647f8f90f52f662b4b5d5dbff3cf006b4530d8669ebe59b1928944
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAC 10560 bytes
font_02_sfnt_off00014373.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14373 16792 bytes