Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4a5dcee9b7872d…

MALICIOUS

PDF

76.0 KB Created: 2021-07-23 22:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: deeb746277a0b1140093932c34f4836b SHA-1: bf41e620fb7e26db8b8fbac988681fe21e61c0ab SHA-256: ca4a5dcee9b7872d9c8145a988d8e1da528e76f7fc3ce4675e0ead9363055d88
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and compromised CMS upload links supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc79d8c7df1---pamulinaxanemusikogipax.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c6504312732528e40f6bd742f7d39f1/dekakagaxu.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/8ulrvkq8vrtljgvhlq8v9dkm88/gexusoselelivoxemep.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8f3027759---18707841250.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b0739bb1c39---97320116118.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/681c169c0b30173e6ede81276b0fb210/mugikozonekaz.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607813ae90ed4---37483798703.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1e4b1a58a4b93cbaa6d6b795ad1a62a9/34290382001.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/6hi1qrngqndkgg7saajqsah3f8/65214176667.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/q2sqmk1p3952e144fiv5eqftds525e7k/9027074180.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b4285ab535cb665aa9f076ea6d327a13/lonukab.pdf
    • http://laarakkers.com/ckfinder/userfiles/files/lanupodivefagivax.pdf
    • http://presssimayeshahr.ir/pic/file/853180314.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082824e2e174---zevuveguf.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e4cab83ae1c6f131e09ed04701a63278/66714975423.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/r5vjn51m82fq11bko4j1vrofs3/likuwekirirasuwebapixumaj.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/dffesgqf4ok97eb5b2s285kovq/jibonukunu.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4s3tgk6v3oshdp51la4q36epi1/54438913585.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8079bcf6e3d91c575c37f2a474564e7c/4160788203.pdf
    • http://dynamic1984.com/user_file/file/vedajososujagijutafulede.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3f7ff229f9b389915793d4ffa19553e2/53748731053.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=texas+criminal+and+traffic+law+manual+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_off0000c564.bin
daa2ee9c103168f571ebe410821be61765d97250034a224852f35f1475744295		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC564 16712 bytes
font_01_sfnt_off0000f0bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 16792 bytes
font_02_sfnt_off000108d3.bin
a22e9b1658f38a9b04abef31dc2efb798458bee6829ce326454289aa9578bc51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 10912 bytes

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