Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0c6abf19c25d6d…

MALICIOUS

PDF

88.5 KB Created: 2021-06-26 06:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6788bb634d88c97c851ca245f62c031c SHA-1: fa831385c4c44d2f1b23f533030897de9fe52777 SHA-256: fe0c6abf19c25d6d683b0ccb21d5b9cda519a2b9bb79fab4c9078438059c1f09
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://cructi.ru/uplcv?utm_term=how+to+breed+king+dragon+in+dragon+city
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/db7cb96f9d0fff84f78129a6e34be242/kufedidegoziseve.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/99e3e3ea6a75d34fa222ccf25adcffdd/vidonivabup.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/55aa454fe1c60d41704111692362e53f/91576061373.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fba096eb7c---41790363639.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/bsmoaavkctm2smt3j31cvh5p72/56545125559.pdf
    • http://cuacongtudongbinhduong.com/upload/files/bekusuxezajusa.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc28b3590b---pezegutij.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d216dee5---savupes.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c605546b253---nojero.pdf
    • https://zlato-eu.cz/upload/files/dixonakarujulimavoj.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0ver1h7qjv7ecm2f59c02mk8q6/vojusibomomimozuw.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/6aa5f463f9c3aa339cefc245a00969a4/rusipokov.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/42838523152.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/nopenosek.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6f0f5cc47---patekiwaroved.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/jo3mqre4ou2stgmabfdoa9d8d1/mukexipigurab.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/93016176918.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b35abda3b3---18394251150.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab98db2165e---xedarafapibewawabutevum.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608228e71a940---92139744256.pdf
    • http://noithattamphuong.com/upload/files/waxuxam.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ec873351779cbb61ec9fc7b7479e4582/36268877218.pdf
    • 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_off0000f705.bin
ec761e562fdc97c1dcc7c6f8c8387276fc6601e2fdb6d279442c0c646dc567f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 17328 bytes
font_01_sfnt_off00012444.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12444 16792 bytes
font_02_sfnt_off00013c5b.bin
6789254a5ece1926b231f5361f479c1de310f89e219fc54994e82f636fd51297		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5B 10752 bytes

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