Malicious PDF — malware analysis report

Static analysis result for SHA-256 505085200f2fee16…

MALICIOUS

PDF

75.1 KB Created: 2021-09-12 01:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70457b2fd172386f2025b3664c1221d4 SHA-1: 54540b5c53b7fad8ec29e8f124c2b305a660a3b0 SHA-256: 505085200f2fee16b5b59c959907d9f33abd3b3b1c6a25330a0f7624efdc2ea6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or use disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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
  • 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://kondicionery-ivanteevka.ru/upload_picture/file/46908414555.pdf In PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6da23ed5---xutidej.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/24880418922.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/38603689673.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613429c45c932---nupijasewed.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/571071450.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/77273161633.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/72368060193.pdfIn PDF document text
    • http://vln.nl/files/file/fegap.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132f7400de2a---63322243021.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/sudobujemaxiti.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/gukiz.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/foxugavulajazupi.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/60354236538.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210901_105015.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/nuwaganenurinipidejonewa.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/20403760084.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/josutudefawumel.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/7153092737.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/tevoruboruvaxupal.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109031554439400.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9d4223289---67072178668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hack+ball+pool+8+iosPDF 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_off0000c4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D1 16672 bytes
SHA-256: cc998e1d19ee0754e100cef2777252a3b3b00222ee1dc027f395b0804e7dde83
font_01_sfnt_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 10364 bytes
SHA-256: 04cf40be5a08ef415fca01f3d97f7729e753a9b110c2c66e16bf11f796f2c708
font_02_sfnt_off000106ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1