Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a64f2d323b4f4a9…

MALICIOUS

PDF

92.6 KB Created: 2021-07-21 02:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce7d311e789124b2e501064c14635794 SHA-1: 8e472a54be3c07531553136c10b3d2fabda69c1a SHA-256: 5a64f2d323b4f4a92949acea0a78047efcb63a0d479f90d5655a7539227227f6
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress installations and other disposable hosting. These links likely serve as a link farm to distribute further malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b4c7bd927---vanusododulaka.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/54047677984.pdf
    • http://pantipplaza.com/userfiles/file/81159872457.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/51aac4a21c5554e1937fc14e387ce2fb/13998567219.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2b452edbd---12335284577.pdf
    • http://gfb.it/upload/fck/file/25576979016.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/f3btcob9j349od21ef113uguv7/91153800479.pdf
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/2637601596.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a90f07c185f---lixinemodu.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/4a9252004a3c45cedfb03a4d99ebbf0d/98520241015.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/noq8q0a5er2d08h1vj23o3k0l8/luzubilofujosefowemu.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/c6f82480d1dc8ce43e877ee705b0110d/xixaxapamapuno.pdf
    • https://relans-nn.ru/images/docs/file/lisutezeleponotivo.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/r88o44kv1cu77f1odg1b3rcisi/51153100152.pdf
    • https://vestol.bg/files/file/nofuzenezuvofibibonokav.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a925fcad850d63e02c76ed5be105413a/41983396778.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/wulunovufiseximumono.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b32c5f6353a---70978467886.pdf
    • https://menlopark.com/wysiwygfiles/file/dikotimitipelalemufomax.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/d12e61b4e6763969c63893a56b9ceba0/pekilefefaboxezobak.pdf
    • https://marosme.ro/hirek/file/japonoz.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/eb58e68bd10004090c581a4006cc0c12/tejanevomosaduvukobosud.pdf
    • http://yejida.com/userfiles/file/zumibez.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160838f168942e---71698745202.pdf
    • http://halaljones.com/uploads/files/80299549273.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/a0f22f28a5ed138fd473e9586b9162d6/kameravuwu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=countables+and+uncountables+examples
    • 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_off00010659.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 16792 bytes
font_01_sfnt_off00011e70.bin
0e85407e6de99ba842bb1c3a273951297b1fb85fdab49a08399f1f4ebc0e8b6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 10856 bytes
font_02_sfnt_off0001375f.bin
cebb59981e55a8d70b1e217716d1ed76b37e6f70e17c2821044d66a954116be0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1375F 17344 bytes