Malicious PDF — malware analysis report

Static analysis result for SHA-256 598a11fe59286402…

MALICIOUS

PDF

87.9 KB Created: 2021-08-03 15:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1a4cf0f7ad78cc9ac11614580de9f2aa SHA-1: 3a5baa09e9762579346bed61a844f588a33ff2ff SHA-256: 598a11fe592864028023c1a01e7e04eda82fcfe11b2eb0c04cd454ce436817af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several URLs point to compromised WordPress sites, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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 https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/39d1a00d09798015e5ab9e81bdc23a5b/28263091602.pdf In PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16099e24ed9b84---24703782329.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/g32plqu61tdhhk6r36fops0b9d/vamixudozomi.pdfIn PDF document text
    • https://faceless.me/userfiles/files/wiboragev.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/0a2b2b3770172d66c5426222452de0fe/degifumuso.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f329007b1---dalusafebus.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/vuzugepevifuxoboxe.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/ketivodu.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/87877318617.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb847e173b3---bemoligapamosokodubuz.pdfIn PDF document text
    • https://flomogroup.com/upload/files/rofijazedakas.pdfIn PDF document text
    • http://kag.fr/userfiles/file/niwagiditovidipurasupis.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/dea0a0cf77d27aff66c5e3a12b4491da/vobapimixizovev.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/7872c09fba4766e1bf5b4ee7f978d21a/42313301965.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a1408165e---76750557385.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160effd199289b---2124171976.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/32267143418.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/15090819037.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609465577e862---86646305594.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bea18a02b6---45889615447.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d07cb0610---kexapukawufaxa.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/10913605239.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/58926740555.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/70025505557.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/8n94b6t2jbarb42c1l2d3fe5b6/zerokazolozifuwudorerataf.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ae2303ab1---75272649995.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/86678897938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+measure+a+english+saddle+gulletPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 10872 bytes
SHA-256: fc5e2820ae7bd3fccd1fceef79da57ce4eba8187393ca9e4ace5ebe5fb0d1f93
font_01_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 17228 bytes
SHA-256: 37a02df6df74de6164ab31ad8cf5c58a7da0c47a6b22bdf9f430d2bb7779fc88
font_02_sfnt_off00013952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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