Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb85f3ce4ab63e6…

MALICIOUS

PDF

87.2 KB Created: 2021-07-31 19:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d21ed8d226d17a60897db25f44704f7e SHA-1: b2e21061e3259ca2c4599d62cf71933db071f853 SHA-256: cfb85f3ce4ab63e6c037cbc4198781c571638ad63ed79908de9205ea7d672b9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and other potentially malicious URLs. The presence of embedded URLs suggests an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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=how+much+should+hvac+maintenance+cost PDF link annotation
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4389447b31---furoxora.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/tumawotovanuzupekofarobik.pdfIn PDF document text
    • https://businesslife.com/content/files/30537331385.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1fe66dc8d1f26bbb14fa3ef3a7c9a957/pagaron.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c5b69a106---42601769708.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0682b8dd94---49013204997.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813a9eab175---xoluwixogomemole.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/9592612289.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb6ff83fb6---baxavexulojadem.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/vomalitivokiliwezoxuzita.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee3d6bc283---35631775429.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8d89ac4a5---pumamodipufobikixa.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210709094840.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/meguxadavufewufisonom.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/98850600322.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/vumusov.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/85482190457.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/zeketizobepevasosekexadid.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/kboj0d50l0j3ial14le1ecf893/numolepomesutonutuwis.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/weken.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fb66b465e---xakevasaxilalejokuvumutin.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/gexobemebasoxawe.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/a71204654339b693de562fea369dde2b/jufozefunutese.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_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 10780 bytes
SHA-256: ecd64ed01c27a99691c9928f428f454bc07bafb2b446640d56746a35db65e770
font_01_sfnt_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 17180 bytes
SHA-256: 855fc6af7f5054ea5f9cd0684909c260f551e17a03966eaca730dad6495a5542
font_02_sfnt_off00013766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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