Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0a11d1b89d7517…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 16:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6a37664d73d0c8622a20f1c95a58ecd SHA-1: 01b6555519ff5f24d03117a65858b1c8a12c4214 SHA-256: df0a11d1b89d7517d2b737baaa548c18d9f048ac6ca93b312e72c3004cc952cf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=what+is+the+best+movie+streaming+app+for+android
    • https://jotekonybakterium.hu/userfiles/files/85293235319.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16150350d3a676---rurosegumafirew.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398c8a6a09a---85195461439.pdf
    • https://blogsma.com/files/larod.pdf
    • https://protrialse.eu/files/files/palelabigujelopujevogore.pdf
    • http://hocikto.info/userfiles/file/65572013990.pdf
    • https://sbsoftware.ro/admin/userfiles/file/64133267302.pdf
    • http://obkladacstvikolar.com/content/97104745855.pdf
    • https://stealthwindow.tw/uploads/files/202109111901096058.pdf
    • https://bunianco.com/other_files/File/vusab.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2aad0d7a6---88742227946.pdf
    • http://leebyunghun.org/new/upload/board/files/fakaju.pdf
    • https://888nv.ru/userfiles/file/litaval.pdf
    • http://gorillatheory.com/admin/upload/file/50412697144.pdf
    • http://dorrstrechy.cz/UserFiles/File/muzijobunudozululezaxapo.pdf
    • http://gyermekhaz.hu/Content/site_images/files/zinevuxigodifes.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140c02f298ae---9651732352.pdf
    • http://kyea.org/imageuploads/lozozufiralamox.pdf
    • https://cytokin.ca/upload/editor/file/73204613931.pdf
    • http://watch62.ru/files/files/34657735048.pdf
    • http://orthodoxvaidikasanghom.org/userfiles/file/88461075418.pdf
    • http://baocaosudanang24h.com/uploads/image/files/77208191641.pdf
    • http://architettosbaffo.com/userfiles/files/20569001751.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af41.bin
ac461fe720aec0788a5b896bf01beafb66853ee28266320efa5ea0e74b2f15d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF41 15992 bytes
font_01_sfnt_off0000d7a8.bin
33077d2cf95c8e26d9f6a229c95a2d91698a8d9b5f8f7fed5f5b11aa115ac6b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 11096 bytes
font_02_sfnt_off0000f0f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 16792 bytes

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