Malicious PDF — malware analysis report

Static analysis result for SHA-256 9acf5acc7734ea6c…

MALICIOUS

PDF

65.1 KB Created: 2021-06-14 14:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a7311b4e5c36169dff7c163dadd7425 SHA-1: 6847d463c68950192003fe650388f571a6016c59 SHA-256: 9acf5acc7734ea6c3f939948f0b444cf72d619a666dbf3dab434ee62d9df41ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, further supporting malicious intent. The ML classifier and ClamAV detection confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8602

Heuristics 5

  • 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
  • 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://allytemp.ru/uplcv?utm_term=how+to+make+a+pdf+into+a+link
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/bac85554041f7453d4695545227f412d/jurelupenewatevi.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac49ebef4f8---22509846405.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/a95d87781784bcea16206e51dfc2f5d6/japuriluzovanuj.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/diu0hm1o4ebko5rbtom57oot36/piduvi.pdf
    • http://tcurryproperties.com/konadnew/userfiles/file/81438939127.pdf
    • http://zuche0551.com/upload/file/74267854284.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c4eac6b892efec365190ac27511ce0c8/72330282577.pdf
    • http://tlxzkj.com/uploads/file/111354158975.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16094f5fff0df8---78706328472.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ecc3uue6g6kvj74btl28e6klhj/1040140458.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e049280ac8f52b4ee648b754ccc2be91/zajizibonab.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812dec2f0b7---sotanazutijavobipitol.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792a867357d---wosuzojotabema.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afed15ce583---34615813979.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075966c38a40---68956460847.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/4bk85fbfm4j9bipddto9j24be1/20498839777.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075800dc860b---91446363296.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/avs0oab74ta3fi2vna0bsgi4uq/lawonejamotenaxaw.pdf
    • http://mt-filtration.com/uploaded/file/112802540960be76f4e2615.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c9.bin
36c4e7ca3faf0800d2ba4afc29bd56e1e78d33480b0c14557e890d916da2f3ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 5032 bytes

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