Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d2a75dbf8fd4a85…

MALICIOUS

PDF

104.6 KB Created: 2021-09-06 13:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d20924121083eaa2b2c90359a61f6312 SHA-1: af0331efe679cd0406e407690dfd8b6e9bd8a15e SHA-256: 0d2a75dbf8fd4a8568e445d5518fa96b0c49dbad98cc12ac1e219b3cec2bf4be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate a 'link farm' pattern, suggesting the document's primary purpose is to redirect users to external malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://infrive.ru/uplcv?utm_term=violin+bowing+exercises+pdf PDF link annotation
    • http://pattarasawat.com/ckfinder/userfiles/files/rulaguluk.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/gepozuxotuxojugatizij.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210615_66E315378518557A.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/70bf36bef763ead8b88cad7da265206b/zagumuzovekaxil.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/44353411212.pdfIn PDF document text
    • http://brukbet.com/user_images/file/35177267377.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/27494948063.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/9mts4sqpi99459uv3g7nnkq976/4716983590.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b18476c405---vuredatixalad.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608bcb16dc169---tajisosebosajatenoxupi.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/96853303171.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607635b436f8f---davegepilitime.pdfIn PDF document text
    • https://tipresentoio.it/images/file/zuzugazirevekud.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cf7cc66c9---23863729530.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16209019191991414247.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/1293986381.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/47830145876.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/teponerovomififobezo.pdfIn PDF document text
    • http://coffee33.ru/archive/file/wuturizexudutunarix.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/setibomol.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/o501ihvtmd3okktm5998hts3a8/97198829538.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/zavidewulilitulosixumev.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/b3ad04999a8df4a81c26ce52be0b1a81/xixuloguvin.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/54783160004.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_off0001316c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14983 10832 bytes
SHA-256: a73c37eecd95e3acdd3ad98d6a0a4f53e492d688eb6cb93495dd7c6bec02a133
font_02_sfnt_off00016235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16235 19140 bytes
SHA-256: 803a46465b2029385ac3893027ff21845c21071d19eba0a4fa3d2a5daf53ccf1

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