Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ba1b5c1e0a0f3d…

MALICIOUS

PDF

143.6 KB Created: 2021-07-19 02:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8893d6b2e6918eb24c4862545af05251 SHA-1: d7982f4607fd5d3183f3443309ac33e1af66f6e0 SHA-256: 81ba1b5c1e0a0f3d02b3cc37834be577fa2934ea23e57400ef689179d2d1a471
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites hosting PDF files. These links are designed to lead users to malicious content, potentially for credential harvesting or further malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6639

Heuristics 5

  • 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
  • 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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160984161525d4---82140804244.pdf In PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/03ec9fab3bc314f8d810fc0fefb139d1/wupunoraxivununej.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ejk7fgk87nnlubhlqlc8gkkc6k/52998161076.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ebcde6d5508f0fe0f96f4c9ed136d117/nutirojotilidug.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aed14f208---37874460018.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/v47dev984s2bb2vdrnntnv3btp/55388933233.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d74e67ea3---mifusuxutatupun.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ad32e545d30c22a78a5d56e06d401a3c/wuvulubi.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/46834169079.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e517b840939---mavireladezop.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/546f658f2d66c017e8fb10579ed114df/71339004842.pdfIn PDF document text
    • http://accronline.com/userfiles/file/sesesitolisadar.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/sonibevosapulejat.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/e7g8dev8p755jgd5hhourfpbn1/gufefuravol.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/rc50mlk0ihgoaj33mfdtn48ck4/vepis.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/o92boij0cpnsvloq0fh1jat1p1/toxanesikefapizubugosa.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6284b82bdf---pifiwulazosewabodege.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3f3e6616d8906aa473f1c52bdd65318f/22661416763.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160826f16e4430---puwen.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/maveperagub.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec5634d270---69549241110.pdfIn PDF document text
    • https://papiratisk.cz/soubory/59283617005.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2f47842ee---xidofikoperapuvitodiped.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/86232502672.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/20058495722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=reading+test+b2+with+answers+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000201e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x201E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1