Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cd2832df61df8d…

MALICIOUS

PDF

89.7 KB Created: 2021-07-06 11:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7c9c02402d2e67ee2f0beaefdd55112 SHA-1: 167e39cb0496bad9059e0895f85601ddb4a0b3a1 SHA-256: 35cd2832df61df8db14d52b3d8394aaedf22515fb65b562a79b518d0176260bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. These links likely serve to redirect users to malicious content or phishing pages, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cructi.ru/uplcv?utm_term=6+letters+answer+4pics+1word
    • https://viettrungson.com/media//Files/vesuj.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/0d24abcc4f319b32b8b68058e23b13ed/61360951597.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/qefk4dnitjcavjcnp5q4u3hn86/ledunepidomilozujakezoj.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d38e47e757393ad65786692fc486daad/revusekapugiza.pdf
    • https://okinawa4d.com/contents//files/widixelepasunifen.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb82d45830---xijemi.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160705ed4eb376---duwer.pdf
    • http://clingac.com/d/files/35925325563.pdf
    • http://e-hematologica.pl/users//file/13244255535.pdf
    • http://kawoka.com/userfiles/file/28743938262.pdf
    • http://allycatering.com/userfiles/9202581755.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/ebe43ce01cf61843506c25ec60617a51/gavumo.pdf
    • http://musikpark-live.de/userfiles/file/2100962511.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092d43493160---44633501784.pdf
    • https://ipic.vn/userfiles/file/74696646286.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a166a72aae---57119166336.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/85b20837bee1d7ab5226746e7272aa20/76603865983.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b444d87002e---81609070338.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba69acb23---12874368652.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b16ff44b943---50009772971.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa7ca7eb0---4137020257.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/effe5455dbddd0ce02c3ec8a5e4ec066/sokipasuga.pdf
    • http://etnorom.hu/pictures/56292089679.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd550000f95---gemukatibofaxibudojelumar.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609498ef1bb3b---72083105368.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df4d9c3d72---20394084580.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_off0000faf2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF2 16792 bytes
font_01_sfnt_off00011304.bin
fad69228f86f9ebba72c6c24bbeff4e53ad46a5de2c3a7322861e73779f3dab3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11304 17264 bytes
font_02_sfnt_off00014028.bin
45fed2bd0936f999bfbe3a42c259c1a040a4e61dfebfe9e4199737d797a7263c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14028 10796 bytes