Malicious PDF — malware analysis report

Static analysis result for SHA-256 0516d8d187f9c8d9…

MALICIOUS

PDF

90.6 KB Created: 2021-06-28 07:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e07ed05602733ad02cf150dbe6efd28 SHA-1: 29a00cfb34457bf2f092b346378bdd3c92ce2d48 SHA-256: 0516d8d187f9c8d985b9cf010d0de99d9695b49930ed4abe4259e31aefb48017
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple external URLs are present, many hosted on compromised CMS upload directories, suggesting an attempt to distribute or redirect to other malicious content. The document body is heavily obfuscated and contains no readable text, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/q6j2epatrv9kfjh8fbhln53d23/21418296364.pdf
    • https://mytopics.it/uploads/file/tutarojumo.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160922c6a02236---73893125079.pdf
    • http://vijyaiprismcrm.com/userfiles/files/jofuzolozuva.pdf
    • http://mousike.it/img_ins/files/dalevevabazagarepetupubeg.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/af74fc9cd393a3717b3448183fe96e74/52321393233.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cdfca5c0c---paraxame.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/b74cb3ae55bb015a7192be3b24300987/tajowajijibabaturuta.pdf
    • https://hunde-katzen.at/soubory/64760726180.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a5669b682722fb895e46f01ceb949b16/kefoge.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079f43a4d65f---97163721952.pdf
    • http://kennycojewelry.com/userfiles/files/202106/1623434340.pdf
    • http://wawabed.pl/uploads/userfiles/file/74873357170.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/2vg5so28dbngpomf83em3f6ups/94956905704.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c33ae4e4c4c---zotokepebenade.pdf
    • https://cowichanseniors.ca/userfiles/file/90917880754.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/25111683828.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/mo2n5hjk7r2ibuu37bradqa2af/17856533519.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/97568906235.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/62fbnfo1uh9j1h50mj5f7gqvg5/42580495614.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/99ef3b5ffa98588acd356c6d26c801ae/34284253787.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/od4cvvg6vkk2k4jarg283iarla/49436379926.pdf
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/81958489572.pdf
    • http://saovietgroup.com/upload/FCK/file/tuzefasimevefodataji.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a53c41b5f---resedoborolil.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/65459563816.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bsc+agriculture+1st+year+books
    • 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_off0000fc07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 16792 bytes
font_01_sfnt_off0001141e.bin
d10a6d19e63c1c99d5bdc0a2209dca1927849691fc17c5e4adb1bfde9fc626f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1141E 10852 bytes
font_02_sfnt_off00012d7c.bin
215b532cea98ee76699fafcb23711b097dd50d9d932520e7b85d656b85ff4e84
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7C 17440 bytes