Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2922f8e293b05f…

MALICIOUS

PDF

86.8 KB Created: 2021-09-16 00:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: baa393dad989a28335fa465a4ae02d2f SHA-1: 547c080a7140beaca7ebd091d043082dc6a02b1d SHA-256: cf2922f8e293b05f3d4def1b415b46337ae74e397eb5fed7d822b9d814de91c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs suggests the primary attack vector is luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn--80akazwaeiw.xn--p1ai/editorfiles/file/8890353532.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef7d2ad501---50702018204.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/93721173049.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/xubemoge.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613515041096e---84733097108.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/korafoxuvatiger.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/nimewukubovotatugaxak.pdfIn PDF document text
    • http://metapolar.hu/tmp/zamunoto.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/89165431640.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f4e206124affffb9c1170df83bc7980c/gapimur.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/zusekabekilajidi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb8c94e1a---13413816157.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/bofefamelapatu.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b5cbbe1c---lubariradajigukujixam.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090512091773499.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/44061825961.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/11204398581.pdfIn PDF document text
    • http://szm.hu/userfiles/file/20106320077.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/dqeh06gn05qns92jfijmcjjvj4/fajel.pdfIn PDF document text
    • http://secoinblock.com/upload/files/16394117214.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/js98sr0ttj9u6e6ktk5on81ua2/noduvumi.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4ekgdq5lt20pkcceqlmrf5gtd7/kevove.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/12820481400.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/sizogagevuvuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+install+android+operating+systemPDF 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_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 10928 bytes
SHA-256: 3838158f72e97df3bbc6798c49d3eb73e535f64665cb1ed46b04f8cf004dbd3b
font_01_sfnt_off0001045a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 19300 bytes
SHA-256: d9a2e5a15b544ca825d968da99ff99810af7c9638f11384bb73bb6b9a5310c33
font_02_sfnt_off00013558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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