Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd94c970435d41fe…

MALICIOUS

PDF

67.8 KB Created: 2021-08-18 17:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7fc27da36875f57e990412418824d083 SHA-1: 39975d4df27f2d3eb73db286f606daef428e031f SHA-256: cd94c970435d41fec500c2abda7a90f6abe6a4ddc387a23252032906d6b07072
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 a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9158

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://coretry.ru/uplcv?utm_term=sound+forge+6.0e+serial+number PDF link annotation
    • http://interel-rus.ru/test/sites/default/files/file/sirepubewugadiji.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ce9fe5ebdb7792298752a1bc905df89c/88765077965.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/lri89h62lnk0thtn9n9d532sb4/23754209404.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a524d0d8f21---bebowa.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210621042227287436aelc4l.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/paxekogilamibika.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/29458594554.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/06omc6lg6sit2stmbcg8dekql4/52992936677.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/xonikore.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0eb9a6051b8c66aaa3ff96d8819addb2/28810065967.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607626492cc34---69496978266.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/8fpqpvt5os2p8euj2didrkmv0d/rewijoposivuzufufamaxes.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/33677842242.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210812053044.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e2abd815a---jitesijolalupi.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/41012ac4602501fd025a373dcaeda25e/81516443267.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f524fb10c4---wawegesowonapuno.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60dc1303c5b3c.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/98527270797.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/65214577380.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607030a69a99c---litiromepiregovosurexu.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/b699a6454a7a87a5828d40c57a6ab169/pedifesenekisikedatar.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/kurimesopewabov.pdfIn PDF document text
    • 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_off0000df2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2C 11272 bytes
SHA-256: 4ff2c7652a5db8371dd8b8ef1216255852d4612fac5993af974fa5d6e1beecea

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