Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5af251e43880492…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 07:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b64cdda8623fbef83b64d1f1088d601 SHA-1: b9add93f2990690c8cd3e718a8dd37a69b227452 SHA-256: d5af251e43880492d7472f766bdd9dfaa7c5b3d16b810afb8dcea947ed456470
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the structure aligns with techniques used to distribute malware or phishing lures. No scripts were extracted, but the PDF's primary function appears to be acting as a deceptive gateway to other sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0ee1ccb90---56457218557.pdf
    • https://bestofbucerias.com/upload/file/45394415456.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e89551f044---lefikufewerusotixikudo.pdf
    • https://dvg.asia/ckfinder/uploadfiles/files/69826401835.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/093ac75667da1376cb72dceb12155d26/xilitugakodaxunogu.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bb155a9533a---53713727326.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742a2f0f08c---27211586146.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd345885ce---wejelonokopalegawovirow.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2c65178f1---99114961167.pdf
    • http://centromp.it/userfiles/files/bosarikokometiz.pdf
    • http://altaprecision.com/userfiles/file/51959750500.pdf
    • http://gld-lining.com/user_img/files/tizifiriw.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e10a6870c853f363cffab7a366c4735/43525059994.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085afc0c6aaf---86556285165.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/16238895297.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/3oadhgqbnlm2rh6d5t0v1fcb2j/9271080687.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a6e2e9435---95112688307.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/v0iagbadao8dh9f9do1qqcued6/15482807667.pdf
    • http://evevoyance.fr/adh/.-/file/13374679820.pdf
    • http://acgroupenterprise.com/userfiles/file/83639392623.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/hln3e4v4i38mh7me9mgqif7hao/24079382574.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e46cc46515---webujekazarafirud.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/vujilifameweji.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609d456b832c7---32088679061.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d3aeed57b49---42362520179.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=children%27s+hospital+cardiology
    • 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_off0000f0b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 16792 bytes
font_01_sfnt_off000108d0.bin
63fd0d55b0bbc73beaf4c64d54c51a51f49fbc6cb40b6dedf02c402dcca488be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 10972 bytes
font_02_sfnt_off00012213.bin
4ac51c16bbf935bb7e474aa4ad70f4ea4432a7ec5f21cc78577e0ef1c55f144e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 16676 bytes

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