Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd50805678ccbf1…

MALICIOUS

PDF

78.1 KB Created: 2021-09-15 09:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ac33105df98650b96f07fc026e563a5 SHA-1: 286e8e62bfba1dd01b5c8f00c9622aba1047a535 SHA-256: 8bd50805678ccbf13ad5439aa75cc46a7a6e2d87e63cf6f963441a0c84871268
162 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting an attempt to direct users to malicious content. The embedded JavaScript likely facilitates the execution of further malicious actions, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7760

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://tigaintan.com/contents/files/xivajidow.pdf In PDF document text
    • https://a2designbg.com/userfiles/file/kewol.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/gedepolex.pdfIn PDF document text
    • http://lizhechem.com/upload/files/29989953333.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddbc9aa7a3---zaponajowuxomaludekipuper.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/desimosefalibuwemerud.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/76270192896.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/63152793401.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/67607120253.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/rekaxefusejinorume.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/90590903967.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/babejuvobizo.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/tezinugipawi.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130673e66a61---mupagu.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/sujolosavusabilaf.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/gosidetezaluselatujufamel.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/27977941940.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/39860674951.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/19372568625.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/1357750525.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/sufubisisuzilodiki.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/getegimibikot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416e978cecc---7123736036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=add+android+sdk+to+pathPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 17916 bytes
SHA-256: 2ef9d92bfb3bf272528a570c5fbf5a5848cf83dadaa4f3fa7a01589808c226e7
font_01_sfnt_off00010cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12503 10384 bytes
SHA-256: 24422843f4228d89beebf57ea9913ab38de66b92e3f75733e25ede6134ad1a12