Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5e2bce821ee36c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 18:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80291e6a8c3ffcbf3695245ba1cea63f SHA-1: 45c09e25303e02f819c43736fb458e2bb456ca94 SHA-256: 5c5e2bce821ee36cf2a69bafb5bb9b96c9609b20b328458f158ed642ec448708
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic supports the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://lblussana.it/images/file/56590780235.pdf
    • https://ntc-container.com/upload/files/11155605392.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410ee69219f---bowegewolo.pdf
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/12417026467.pdf
    • http://luligang.com/ckfinder/userfiles/files/75381045791.pdf
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/7447816360.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161433858ce887---49095594780.pdf
    • http://nhuaduongnhapkhauaz.info/upload/files/21435239514.pdf
    • http://barrospizzadb.com/uploads/files/lemexozuson.pdf
    • http://color-gateway.com/userfiles/file/malinozazaribuxabowi.pdf
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/88028162872.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/c63941f793d67d11d13ac1237974a612/pivoketelelis.pdf
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/30253309413.pdf
    • http://meghdoothsuzuki.com/uploads/27652702220.pdf
    • https://cambodiadriverservice.com/userfiles/file/10158975422.pdf
    • https://vzglavniki.net/data/file/21820939767.pdf
    • https://labelmarket.eu/data/file/83489467201.pdf
    • http://npk-bypassdrr2.com/file_media/file_image/file/31685789348.pdf
    • http://canoto.us/Images_upload/files/7802059598.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d5d292fed240b4ec665274176e3de196/sejapug.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/scjaid06brr6cvqv2tfdpupbfc/28688309348.pdf
    • http://computerdoki.hu/user/file/vovin.pdf
    • https://fcksa.com/ckfinder/userfiles/files/23183652355.pdf
    • http://farmaciafici.com/userfiles/files/34721973280.pdf
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/58288062470.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fifa+14+psp+android+download
    • 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_off0000e8df.bin
d74b01149477f0bfa9bd6b6da4caafce7768ba399538628f7bc11689490563e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DF 10456 bytes
font_01_sfnt_off000100c0.bin
cff8c6d3e3073f28d9355f51fb68442299416f6ec0669ad59acd1c0968831c36
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 18608 bytes
font_02_sfnt_off00013177.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13177 16792 bytes