Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6806b73fe478a5e…

MALICIOUS

PDF

78.6 KB Created: 2021-06-18 20:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec4c23f2a1aeec9e7567f77916d220ce SHA-1: ff5258480a83e043dc521324cb98a9af51120664 SHA-256: b6806b73fe478a5e591d447d6c92fe732efe04868fe727577a78891053deb2a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.kickcommerce.com/userfiles/file/12005758228.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d5eb57fd8c54febe05a0cb0cd92220a0/fowefe.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607363f11ebe3---78397026863.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7b963b850---82893730405.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/87119831850.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160778b14b4f52---23729603993.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3667949b7d---93009185566.pdf
    • http://esoftland.com/userfiles/file/27451629449.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/vizina.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/eufoqpi9c52h89m4ru0rrk5nlq/jazesaxatitebin.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd009a6cbc---vaparofaz.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/39aef4611f527e24aec61246be13a2b5/zikekujafu.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/d8e4h3iivg9ef0tschl8sfon6v/ruzipumosekisafam.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8hvcjukhiefuv2asnbpj0nvnf4/84813832.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f117bf14c1---sixogedokifiduwetotemu.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/47abea26f9d2706875caffd12e5d0a17/5803840333.pdf
    • https://obermeyer-modemarkt.de/upload/file/wobozojiwisagulapag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=real+credit+card+numbers+visa
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2fe.bin
46835d74d533eb928de43b2206065a19beb313af4af4d67a424cf014f70c3f91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 5292 bytes
font_01_sfnt_off000104f0.bin
0ab181254e52da1c52b24784eaf399e035fc4d0210b4147ef7b714627933df61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 12412 bytes

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