Malicious PDF — malware analysis report

Static analysis result for SHA-256 483659911a7ae1e8…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 21:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e317a591d48d00e6089f8792a2ba44fc SHA-1: 947b6b16e9cba755e0e4acdf49f96bc2ac3a9088 SHA-256: 483659911a7ae1e8958495e933c53a74e8881850654e967f18c69a196b86e157
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=electrical+engineering+articles+pdf PDF link annotation
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088541787731---67329526725.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/rizew.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/15071072381.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/bakokawetap.pdfIn PDF document text
    • http://airsoft1.ro/files/file/raxudameg.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160eff80da7800---venukegelipebo.pdfIn PDF document text
    • http://schokofontaenen.de/idata/sitoratufitu.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/11948857677.pdfIn PDF document text
    • http://afro-safari.com/upload/files/44363173007.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/wefodujikelapabuwifibu.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/90360258143.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858cbd7d012---jixoferudurenuvej.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/zinotibadasenenitos.pdfIn PDF document text
    • http://3sdent.com/upload/files/defotobibakepifu.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/25889910182.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021082113043141.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/lepenuj.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/3dcaba500b77f736733d6f51336acab2/39750823877.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/vijadadurafibilixugeje.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/12103897667.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/94607177824.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/rejipofib.pdfIn PDF document text
    • http://gptools.net/userfiles/file/89158198341.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_off0000d730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD730 17340 bytes
SHA-256: f4ee6b4c9a490a2648ad4ebf9950d3e34e4ef0aa7ee48dc9eed4b292399e8548
font_01_sfnt_off0001044c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044C 10660 bytes
SHA-256: d57a4fa9f231c70eb002b1d8f4165166a6c67c86e4b9d7b559dae35c609bca6e
font_02_sfnt_off00011c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1