Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39a5a2fdef16201…

MALICIOUS

PDF

85.7 KB Created: 2021-06-25 14:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6771ac13d2e46fedde261915d0142b7c SHA-1: 988529ca31fb264dbc64991ca1cf4406641b512e SHA-256: d39a5a2fdef16201d153a6b37f7e1ec77dc25a74cc60a3f13c328a147a457d19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8405bbafc---5029202973.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ed9515bca---98227814993.pdf
    • http://alanurturizm.com/rsm/files/27324174200.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0f1371472---lugikuj.pdf
    • http://progfin.pl/userfiles/file/buvejupuzoxeduf.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/msnr4u5uj2j6j4ll5nfpdq7381/nabivoxobutapefejiwam.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/553e2df88c3230ec3342c5bd8174c6d6/firimufoli.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/v4fu3dn2pt5f3suqpr2k4ms9h6/7653775360.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b98e74aae---3181536817.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c86157e7d0---gezedexexobizanad.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/5rc6pund1k7j20n4100mtdhjp7/daduru.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/001469e6cc54ecb02b7ed38a25e9d255/lukuzudofilomozemo.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608591df03b11---22158202506.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/c2b594d2e3b3cc8a8e299430e79f4e0e/44489499520.pdf
    • http://dulichtantai.com/files/uploaded/files/29379577207.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210507071018562055j8tylr.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+global+expansion
    • 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_off0000e890.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 16792 bytes
font_01_sfnt_off000100a2.bin
b1d8c70fc0d7bef5a9d02baa0b8af0bc12244de7a3e15981eb127b4e5c3f84c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 18452 bytes
font_02_sfnt_off000130bc.bin
6988c191c2f4db70909c0c1bf376609c96a452488781c6f8a6d9e1ae17b05cd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x130BC 10668 bytes