Malicious PDF — malware analysis report

Static analysis result for SHA-256 7983c81bb93c23cc…

MALICIOUS

PDF

93.0 KB Created: 2021-07-02 11:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 602ca44efb0bd06ebcd9c745f35179bb SHA-1: 84ad6d9e581a0205f7066ceb3976d233e3d3980b SHA-256: 7983c81bb93c23cc548b292da9aa27062c7620871079ce2168d4773e850c23f1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a compromised CMS upload storage for some links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ilturismoinitalia.it/userfiles/files/34513957545.pdf
    • http://win-sonic.com/kida2018/ck_imgs/files/41350028451.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/efc8d982734cd3c42e6ce97f00e381dc/vododopisi.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c2291d82878f94a526755c85ba0bce38/vapomomepes.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084d0cb8dfe4---jitod.pdf
    • http://china-engine.net/ckfinder/userfiles/files/70543711803.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/9139d93849ab11eeb51d8d33b91ec09f/60067893492.pdf
    • http://esipro.fr/userfiles/file/lulimerurowaxigurelar.pdf
    • http://dahchen.tw/userfiles/files/zesowewog.pdf
    • http://2440027.ru/upload/file/garapadapoxoxonijerutajo.pdf
    • https://bahceneryaman.net/public/content-images/files/bogimamefufosusazenar.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/fc7317326cf79a333b87914ef6387bcb/befibabekexamovixixitexi.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fc2c91de3---39706953002.pdf
    • http://abwingssuffolk1.com/uploads/files/domatokafitimosinevo.pdf
    • http://ctkupavna.ru/upload/file/mafawiferewosefu.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/6de380fcec73d9293e07f7fff381eba1/zubojonejekaxesug.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160971b2071694---76216349238.pdf
    • http://ccspevents.com/clients/24998/File/loxalenewejufireroditidut.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa9fa81752---869179224.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/faveboronebomer.pdf
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/68025278745.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=moist+lips+and+chapped
    • 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_off00010795.bin
e1571aeebf278faec582b8b0381de4fb1e6723cc97c55259bde853056ced2937
pdf-font-stream PDF embedded font (sfnt) at offset 0x10795 10504 bytes
font_01_sfnt_off00011f6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 16792 bytes
font_02_sfnt_off0001377c.bin
d4077df9662f4ae24ebe2746b3e7ea688a57427d18e79fdcaa22a2c4a9c44aa3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1377C 18584 bytes