Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd08540431922d64…

MALICIOUS

PDF

72.4 KB Created: 2021-10-01 03:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da934e4fcbdd747bad3591c8f9e50c39 SHA-1: b0d559ed91a50359c87acbb125d2fedb277b74ad SHA-256: dd08540431922d6430ccb7208452686ab33ff893f444889c12f7d83b57fa35b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://queure.ru/uplcv?utm_term=basic+instinct+full+movie+online+with+english+subtitles PDF link annotation
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba08a7dac3---gakexadubikunopako.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f39f06ae67---32447395719.pdfIn PDF document text
    • http://word.mn/uploads/assets/48884959544.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/71987796151.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/gipewutivufufonip.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/dibuw.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/sugerigutaje.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210930172828-megudasafa.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/xajasidolejazekexopevela.pdfIn PDF document text
    • http://byecook.com/ckupload/files/13824379306.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/wexewatodo.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/wuniwodufetuker.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210918093451.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/24617262242.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/tutawusekiniletulu.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/76023036014.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/57357313256.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/toxulezopekafenukokat.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161329fa9d47f7---28393184816.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151514ecdffe---86645326490.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/82118260534.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/memabifij.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/23890618932.pdfIn PDF document text
    • 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_off0000b31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31F 11128 bytes
SHA-256: 3dede000e0397f9c39eacf479a66a610e32a15b0f4c815f917b393eab8b60fec
font_01_sfnt_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 18248 bytes
SHA-256: cab4e47810f2a4e4d625c8c4e767cb74d007d01ae4c5e2d5adac4c6e20ae8591
font_02_sfnt_off0000fb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1