Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef0d1b8adebdfad…

MALICIOUS

PDF

96.4 KB Created: 2021-07-01 18:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d49027d0d31e45771840885c168aa58 SHA-1: 5f68b5f062626c6ecb013f7bb2f30548aea971df SHA-256: cef0d1b8adebdfadb6d5e24a3866ccf6973b9578e956c74fb999d20c8afb2919
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content or phishing lures. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure suggests it's designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9c1939e7f---10711283088.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f6e98c94ca0ffa9f5bd77a587134e571/rezunotimuda.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc8224189f---6985402813.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/jensqo1e11br32bess0jbshdom/96025459529.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/83679431183.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/mn3hj27p0v6d47ogutapc61io6/likisotonameb.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160711139f0a77---sabugijado.pdf
    • http://regmac.net/userfiles/files/10121014248.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/70297752965.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/49962454920.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa5f5c014---zobisovidakibozuvagisup.pdf
    • https://cncostruzioni.com/userfiles/file/31017829449.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a9e3a77e2---zonorareziviluma.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/v6skteicg81v3qv67bdeb0j2b2/sojurubogugabumolapugom.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/jmtceefu8cja05cs5149shd92c/talokifixomusipiluvomir.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bec981dc80---jowezu.pdf
    • http://wasserburg.pl/userfiles/file/mumuvezax.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3fa0df758---bulezavanezojamaza.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/4i8smlfldrb1d7tau506fr0nl1/gapajifavomuwujuxagub.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0f745c74b---bevelesez.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba4ec22c8e---burataxekex.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160726b621fe70---53375411367.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/0tejl8ommv784e9ccr87qh5ldh/57199881458.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b8a3d83f4e484abcdcc31303395c37f4/buregenexep.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=south+indian+recipes+in+tamil+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_off00011532.bin
1ec69efaaab5a697e68476114efd1d478b02610c34ad2c87dba5d58dbed489f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 17292 bytes
font_01_sfnt_off00014290.bin
3309d17867322b3205cc2873d9e61ccbf0d4d98c8b0c21fff0715e0a304510da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14290 11060 bytes
font_02_sfnt_off00015c18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C18 16792 bytes

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