Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8dedb1f790c6d7d…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 23:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a605ce0c72ce5d74114576b1c88eb80b SHA-1: 985dec3bf6c91eeca06a9a13b4996555e530a448 SHA-256: f8dedb1f790c6d7d91896c65cd7083ca496be870fc4a29dcedc8f9ebc496b524
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://www.smwiarus.pl/ckfinder/userfiles/files/wafagole.pdf In PDF document text
    • http://vibratingsieve.com/d/files/loraratunavopavab.pdfIn PDF document text
    • http://ttc-investco.com/img/files/rawaliloxibefuvojig.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/wegazobudonufeso.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7c2266bb5436733cdd059701458ea1f2/31668385649.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/24445001069.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aa0a03b25---42658348044.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/negebizozifogosepuzetigeb.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/xudinaf.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/nafatimekopaxixebezake.pdfIn PDF document text
    • https://akconta.com/uploads/files/pokonin.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/patusopesagewal.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e7a8ea74b---2428848383.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/fodabedog.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/vubufudatapurabo.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/romiwevopujikokepe.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/zubuloro.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/43701870875.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/70901000465.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/gebikewupufonu.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/dizujuwogupitav.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/motajobujotipo.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/puzixigafi.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/99544006385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=environment+and+market+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000b20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20B 17080 bytes
SHA-256: 20cbe612fe485e93e2c729e11212e69152e8939525608eb8d43e259bad666304
font_01_sfnt_off0000ddf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 10588 bytes
SHA-256: 45e9f6aeb107a4d0e812a79bc9c52663af764a00a3b85c3974b321c7e2e77ce6
font_02_sfnt_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1