Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77501cee6510835…

MALICIOUS

PDF

89.9 KB Created: 2021-07-21 04:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d709e4d0b05190f2a2e03f031a40ad18 SHA-1: c1a5054d835981ce60aa25442597998331806c2b SHA-256: e77501cee65108350b6b2fd455fd8b1fad0c05bda84a2898f367dadbd14bc414
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of many external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://alimentosldm.com/userfiles/file/65200604070.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/8b96a3eed19aa2b96522c443fb4c7f93/66374138528.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/88587525710.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/2c436aa8728f1fd3c3d72a970b9b49a3/valunudoxomuxa.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa8e25902---daget.pdf
    • https://ludifrance.fr/userfiles/file/44770001282.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/nexikepewak.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9a6900d00c6e76613b39c1c4a8a72dbc/poxaletiwen.pdf
    • http://studiotecnicofrisoli.com/userfiles/files/pepedusuxogoferoxez.pdf
    • https://advik.net/userfiles/file/81741226302.pdf
    • http://aybar-gallery.com/userfiles/files/86393590485.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0cb9c2211---9020643236.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/hh03m3q5tjjtcqcc8cgacko3g1/10557802438.pdf
    • https://alternatifhirdavat.com/upload/ckfinder/files/xowemudetifibevulewoxiwe.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607948085d8b3---64448021111.pdf
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/pejot.pdf
    • https://cakesandcupcakes.net/userfiles/files/73088947704.pdf
    • http://chi-kara.net/userfiles/file/mapozuruxileruz.pdf
    • http://portalpr-b2b.es/img/user///file/_0531139001624370378.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6b7b3b32d---vuwidugowo.pdf
    • https://detectiveoffice.net/userfiles/file/30858903434.pdf
    • http://fxmeat.com/upload/file/7d6ff9b7c1fbad562248cba2b619ba7d.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=public+administration+meaning+nature+and+scope
    • 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_off0000fbed.bin
6387d70103ce08a8c1805d8f1fed476b66f406f62760f95fc64fd6f312e96626
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 17196 bytes
font_01_sfnt_off000128e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128E2 16792 bytes
font_02_sfnt_off000140f9.bin
9dc906304e91faf2e25aa591247c6151ad657cb63441a2c0bed2db070cb7a470
pdf-font-stream PDF embedded font (sfnt) at offset 0x140F9 11096 bytes