Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c0feb85108c4ae…

MALICIOUS

PDF

76.5 KB Created: 2021-09-08 07:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d48efd783ef4d558616422832407b50 SHA-1: 1bf38bb9007d5add9c209fca6eb2da2d32f81c24 SHA-256: 66c0feb85108c4ae5341c84c767dfd0298b3793e63f5476d3e31cdda33bebdfd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised WordPress sites, suggesting it's used to distribute further malicious content or phish users. The 'SE_CALLBACK_LURE' heuristic suggests the document may also attempt to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcd006ac7a---63018495743.pdf In PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/voferogolevoti.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/gujijupoveredofepibi.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/sq71l7ls0er695vh41iebco62g/17712183625.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2190f417c3b7d1e962773a199a52a9a5/93554928569.pdfIn PDF document text
    • https://masihpt1.com/contents//files/73877413925.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8ca7bee06---gesebitomutilora.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/93b407585d4be8094c1e8d112fe07d76/38799565873.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/98949448790.pdfIn PDF document text
    • http://fitviewer.de/files/file/58281309117.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/66124284968.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/wizajekonetaf.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86347cd16---kapegaseditone.pdfIn PDF document text
    • http://platcometals.com/images/file/39845848651.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16105d6d9acbb8---gavuzawuraberire.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/jabuz.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/11030743438.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/9fba97423a50560c295a4743e8da9bf0/4456836447.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c950d100ce---ruriribuvumelimagufu.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/df5d0d34b4c74788440c5c23b146ebf6/31936705498.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/togebokibubafezezudi.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074468557bf0---46534268753.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16129e3ba5c354---gowixinejasagezewo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612df199c198f---11680022743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=jurnal+penelitian+sepsis+neonatorum+pdfPDF 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_off0000c798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC798 16740 bytes
SHA-256: 3ec19775e20736b16176af940c2c3fc38c389c6dea4950de64a77cfc42142f10
font_01_sfnt_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 10748 bytes
SHA-256: 9535d4f95d0301db9b5dd7a6f7c2f75c3129fb6cffe79af561f2416976a426ea

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