Malicious PDF — malware analysis report

Static analysis result for SHA-256 8721a9d2c23aa202…

MALICIOUS

PDF

94.5 KB Created: 2021-07-04 18:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7b64eae4c3c77dc67202cdef45739d0 SHA-1: 91902dc9ff01c44a057153100709d653bd5ade60 SHA-256: 8721a9d2c23aa2027b92b54966b572f1dc59022d25998840d91adc4da1eb3797
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97e7f3dcd---kuxebopuxuwokizegamojon.pdf
    • http://feach.ie/images/uploads/file/9328131854.pdf
    • http://maroba-zirndorf.de/file/10656496333.pdf
    • https://webtechnocrats.com/upload/file/32667792667.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e9f051b01dc0d7bb06f8c3282633e7f1/93797286407.pdf
    • https://deepankarbasu.com/FCKeditor/file/fivakugu.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/729568blehrpdj5odllb1re2h3/22605459439.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8885cc68a---61825284734.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4b11f3f1b---42988185084.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/d3qrmuesb103gfugfqvb2tqitm/vumokewefenixo.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbd4e060b3---jimupifosegidafonaz.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o4h50ursm1tnfrvignq0i8u9g6/650357517.pdf
    • http://tunglamgarden.com/images/fck/file/pazurabunurasopede.pdf
    • https://termoformat.md/img/files/damususemotinovoren.pdf
    • http://veronikavilla.hu/userfiles/file/rivegeronovidamewekez.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6a6fb703c1554aec2daae0be71244710/13446169129.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087c48915cde---pilul.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/68b4009b73102bf3772c9f36e1fa95d8/kirijuwugemirulewonaxeju.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c621cb9cf6d---fizokeropemileroladatel.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/83488118792.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c6bfc31bf---84624319758.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/40b01ced4ebe8e0d2d7033db2354a6a1/42861551125.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cc9915ca9---14324088656.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae76b7193---tugareligowamemipusajakit.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d3ea7db052157c4fbfa85de0c32010ae/53247903447.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=side+effects+of+hallucinations
    • 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_off00010fa9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA9 16792 bytes
font_01_sfnt_off000127bb.bin
1270fe3b7662596e956cdb4c005b0787a754345a82b6027134daa34fa86475ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127BB 17048 bytes
font_02_sfnt_off0001547e.bin
059ee924ceca010874775c9ee5c4cb27cc4eefd14b25faab30012754db114643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1547E 10648 bytes

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