Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb19f2ac74a50fa8…

MALICIOUS

PDF

121.0 KB Created: 2021-08-06 17:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0f2f1be49cb53cd00a46956e0ac46a8 SHA-1: 2e4508d35de5a51be5aeada6958b829d5dfbf21b SHA-256: cb19f2ac74a50fa85e392cbe5c9a607ab4d7830a52283282fc1ebe6a712cf393
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://maremio.ru/admin/ckfinder/userfiles/files/47000002563.pdf In PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/28353439587.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7906cc1f7---kewiwowodutadimuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ca7edd9896---19192188844.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/961d2fc22de07a8bab9a9ce8c15e7563/komudukipedaxodafewoxi.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6c775429f---sagenid.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/46806871933.pdfIn PDF document text
    • http://klpa.net/userData/board/file/bedasifabofozezifevoma.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/katagifefajetogufo.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a148225c9c9bdf0297211dfa0c5fec8b/fiwuvawakokebafisewi.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/07-30-02-59-51-85.pdfIn PDF document text
    • http://bienbao.org/uploads/files/lojagodo.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/bivaki.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/72577981131.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/51866946574.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210630115404.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d1273bd37---16703485507.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/wipulumobuvasebigidibavi.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/4299996148.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/qocev9hu9msfdb7r6gnb6ftubl/50924081216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=%C3%A4therische+%C3%B6le+nachschlagewerk+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_off000174b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174B3 18328 bytes
SHA-256: 8c36fae5ad7962858812a20615db16f6f74ba7fd81b519e2e232cf466d0b2258
font_01_sfnt_off0001a1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ba0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA0D 11252 bytes
SHA-256: a3169cd17d811300f48cfd64ec1b2ea9bc4ead6c45a94dca8105a7fed3557db7

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