Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4dfb4cc5b2c147…

MALICIOUS

PDF

77.3 KB Created: 2021-08-09 20:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb59ae3517bd68da2e9a60be6d66174a SHA-1: f47c886f8eb0ed84effecdaab62d641058fbfa86 SHA-256: 9f4dfb4cc5b2c14738f04ae5ad9e84a6a67afb574e1c86aa615c5f13534d9c25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://philabc.ru/uplcv?utm_term=phonics+grade+1+pdf PDF link annotation
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c3aa7c41f---62943887398.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/dosipirezagetanabaful.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/2ghcg0scelcfp0ao4fq04qqme0/lifomolupotokoreko.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609202eda16d9---25225303069.pdfIn PDF document text
    • http://opersan.com/file/tefako.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/88589689420.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/5546ffddbd238f96615ee0e9e4368525/lodijurulededimuz.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16082e86b0ae44---labigeberib.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/682691730.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/88287089623.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/57040653920.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c71d104109---92452345013.pdfIn PDF document text
    • http://eurekaloggers1970.com/clients/a/a4/a4917853023b9a70bc4506ca58f09c65/File/puxufoxufawarasaxugokipu.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7fc938fa9af926b9146878f6e8d6f40/xewameso.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/23163324309.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a3a78a4fb---mirekinodefal.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776cc3b436b---mezoxemawipo.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/44943540469.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/gujurijazewavawu.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xojebaxofazazopuw.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/56288025585.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/b6ffc7db01985d7db4f4c4493adcec40/896168005.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/693399118.pdfIn PDF document text
    • http://newmob.it/userfiles/files/14679941350.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f0853f0c3bba82ca966d4f0dc1627fc4/96504069468.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c5383c2ba---dogozeruzobezug.pdfIn PDF document text
    • 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_off0000ca7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7B 16624 bytes
SHA-256: cff322205a0951fec2e388547485d502449d6fffe6f6d19e1551134ffc89b4fa
font_01_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 10808 bytes
SHA-256: f112e7d16ad41402fde127d4d84e093f51ce3d9116ce4995c731d8bb4e1d8626
font_02_sfnt_off00010e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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