Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f46194fddf0ac9…

MALICIOUS

PDF

69.9 KB Created: 2021-09-11 10:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3080c0d05e737afad796b92314dd216 SHA-1: 397fd17ba7b45175fbccf82109279fc7957eba91 SHA-256: c5f46194fddf0ac9eb571510e8cf5c865e666a54eb2d449d38eadea9a00f4b6c
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 WordPress uploads or disposable hosting, suggesting an attempt to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document's structure as a link farm is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kaptenhoki.info/contents/files/vuxenagi.pdf
    • http://ceraunavoltapizzeria.it/userfiles/files/wubewetu.pdf
    • https://iqmuseum.mn/uploads/files/93809945674.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef527b62b---jedugakeno.pdf
    • http://aan.kz/ckfinder/userfiles/files/75015896374.pdf
    • http://firewheels.pe/userfiles/file/61475373332.pdf
    • http://dienlanhhuubinh.com/upload/files/69069255138.pdf
    • https://facades-et-traditions.com/actualites/file/41534973815.pdf
    • http://ammk.sk/userfiles/file/6830013758.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161395a2277441---61943889301.pdf
    • https://elitstroycraft.ru/source/file/20390824975.pdf
    • http://hstechno.com/userData/ebizro_board/file/53026169565.pdf
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/63671749219.pdf
    • http://printrun.nl/userfiles/files/75810077830.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9c4dcc35391dd840da5ec9bf2ec4d6d7/zuzavagubojepebiwemav.pdf
    • http://eternoohydro.com/d/files/72059658555.pdf
    • https://soudurelausiere.ca/upload/editor/file/jidadakuxomafebetut.pdf
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/44121659369.pdf
    • http://panziofabian.hu/fck_kepek/56512089627.pdf
    • https://qkon.ca/images/file/94851066254.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/896b2f818829136fb7999420654e3aac/tafatari.pdf
    • https://vinocastillo.hu/editor_up/nukabijojofenamuvexotugop.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161313d9342f0d---denuneseromerelole.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/51845084977.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hanuman+chalisa+mp4+song+download+pagalworld
    • 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_off0000b33f.bin
db4e527f136e79af2ce439339ff656af528ed28b435ec132e373fa16f6b37a61
pdf-font-stream PDF embedded font (sfnt) at offset 0xB33F 14876 bytes
font_01_sfnt_off0000d87a.bin
270a5bd3f736f742e797fae9c474ac955c006b44b0b78673aa5c53dd3911c44a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 10984 bytes
font_02_sfnt_off0000f18e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 16792 bytes