Malicious PDF — malware analysis report

Static analysis result for SHA-256 8891e7fcc4b84e93…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 00:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7de195b227042280c09bce3c848b2e70 SHA-1: 89cfcf45859288a277ab891dd59c3c9a5b822e28 SHA-256: 8891e7fcc4b84e932cac2e388b8cb421bf06aba121c75e01d84199c3d68f7e53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, a common tactic for phishing or redirecting users to malicious sites. Heuristics indicate it functions as a link farm, potentially leveraging compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and external link behavior suggest an intent to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://inwebjor.ru/uplcv?utm_term=the+little+hours+full+movie+123movies
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/45355278422.pdf
    • http://spielundlicht.de/content_provider/documents/files/3170969672.pdf
    • https://odontologosmalca.com/images/userfiles/file/85404936194.pdf
    • https://tidurmalam2.com/contents/files/getet.pdf
    • http://jungam21.com/upfiles/file/1630475114.pdf
    • http://dreiseengrundschule.de/files/64870694295.pdf
    • https://valerart.com/ckfinder/userfiles/files/kixabu.pdf
    • https://chezgregoire.fr/userfiles/gonukewejiwiwi.pdf
    • http://artechq8.com/beta/uploads/files/poloj.pdf
    • http://samtekelektrik.com/files/kurojawufeze.pdf
    • http://www.physedu.in/newsite/userfiles/files/rapif.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16152bcd92910a---95513225275.pdf
    • http://avandcie-automation.com/ckfinder/userfiles/files/74384672681.pdf
    • http://exms.fr/sites/default/files/file/depotagenufiluwevuwezafav.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/161337a1ec18cb---jutikazeseralewane.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136511fc51f5---zatinoziruwerijeduwuvufaj.pdf
    • http://xszhuhai.com/uploadfiles/files/71264328134.pdf
    • https://tgvl.in/uploads/fck/files/mekixisunonitimuwe.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d8cdcd0eaeeb29f6b51525810b577a04/fedogilamukenor.pdf
    • http://caratow.eu/userfiles/file/68884835591.pdf
    • http://italianopizzeria-pg.com/uploads/files/wuzuduxero.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/66196143307.pdf
    • http://www.mariabeckmann.com/fotos/uploads/files/19977523408.pdf
    • http://zamdq.com/filespath/files/20210918140407.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_off0000aec4.bin
cd3b2213cc56f1eec1b4a7d764f4c41dca5ffe61c0fc8a3dea8e5cbd9bd504a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC4 14956 bytes
font_01_sfnt_off0000d417.bin
052da7184847327d296f8dbfcad9b2a221e8401fc7bfe6b31c70b61bf3391fe3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD417 10688 bytes
font_02_sfnt_off0000ecc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 16792 bytes