Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6c0f5eee9e1762…

MALICIOUS

PDF

87.5 KB Created: 2021-06-27 07:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b3b8d0ba60f5fa87f159b17285ab408 SHA-1: f89229a0c08a070908ef6f9e67983a36f0bfce67 SHA-256: db6c0f5eee9e17629205bdfc261d4f1c94f6b200ec15fe40c40056396c897c39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://irlanc.ru/uplcv?utm_term=harry+potter+invisibility+cloak+who+gave+it
    • http://playeasypiano.com/resources/fck_images/72332006789.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d5af1955bed---48647238150.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/safobufubejum.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077b8ce328ed---91009017894.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/to45fnuqe4c9ubmrtuqpok8963/tazarifuniterovajuzawid.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724f76dba6f---xikukujeluvukejamuweza.pdf
    • https://bdaudit.ro/userfiles/file/50433364525.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3f187c5b---76101842434.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/56c199d9f077f3b53ae7f7b0e3e3a278/vobufoli.pdf
    • http://umrllc.com/userfiles/files/jutizavebebobaselepatab.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d01279ce4c---9587887651.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a56fa85a81---1830457666.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/737b3cdad9c6765c49909cb5c54c482a/87985678358.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/0fc2jdikprvl6547nan2qnata0/xerew.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8972803d37b4b35ef9c0d5448fbcfbbf/kuviruvuzipoxubukalegesax.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/200feb60be6247d3df92fa647cef1b34/2737218551.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2d7e09be8066b7506dae1dfe38acb193/kerepawiperipuw.pdf
    • http://dyglas.com/userData/board/file/wugexexeromaside.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/62725221532.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/32e7b2a25f4699edf76bbc472d80ef17/bokezaferes.pdf
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/sovusasogepi.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5827eeb197---11771160949.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d07701645ff747677fc7afe1c81cb274/gerovafubamasifokejipem.pdf
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/2a7c44e4bad4d900ea5b4e2e0bc4db18/33831300617.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ca5ee867e2f8ae4e4e8babbe226b7060/34261076726.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609413ee42d5c---99292780700.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_off0000efb9.bin
03ce3ad1366703e48412a6ccd69d220cd6af6cd6cdd8c0a88693efacdab2c5ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 11140 bytes
font_01_sfnt_off0001098b.bin
222cdc9a5bb1badece262314d875213cf068f7dac74a50402a4c29d982ed330d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 17796 bytes
font_02_sfnt_off0001380d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1380D 16792 bytes