Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde8d1ec4307fa53…

MALICIOUS

PDF

62.4 KB Created: 2021-10-03 20:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3415d58ee2abb61224fbe3aede663e0d SHA-1: 4ea09027ee06b35109f2376091ded23b306af17b SHA-256: cde8d1ec4307fa53b3430bad1473108338df4bd9d43ff276570b7f6c686fc4d3
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded links. Heuristics indicate it's designed to trick users into clicking external URLs hosted on compromised websites. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a delivery mechanism for further threats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6567

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 62 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://catamma.ru/uplcv?utm_term=frontotemporal+dementia+stages+life+expectancy PDF link annotation
    • https://soudurelauziere.com/upload/editor/file/79803048626.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/4921651045.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a608707e44---67004046287.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/tawurizabuwizirob.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/484d6d47027d322b4a191b884ae592ed/piguson.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/50190160036.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/jawotinejomovirijopim.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/xiraxelekebajeb.pdfIn PDF document text
    • http://szm.hu/userfiles/file/62566405231.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/42560666062.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/75253080219.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614533a36a2f6---20912980535.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/labevukowaza.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/xulipadake.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/81776782725.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/beveruvefejibiloxudifa.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/57462853584.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613904f35ec92---46591139028.pdfIn PDF document text
    • http://c-six.it/userfiles/files/dojuxudeduv.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e890fe755a---busiguzorasuber.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/juwitigigutopebomuzasu.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161420931c4fa8---30834110167.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d7cc08dfe8bb4a4c7c7e15d945cd3be9/sewoduzapemav.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/p70e3k83nt8rof4ikne80ldtc4/gojoriwodaxafe.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D3 14372 bytes
SHA-256: 43ac56ab58bac4769f4f2d33c5a8d8d9c6d09a1febee1eb5a02d6a9bd4cad784