Malicious PDF — malware analysis report

Static analysis result for SHA-256 64836cf8bc41e1ab…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 08:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f61fae9d81867d86e902ec2818ba35a SHA-1: b05ef30177654994d85f0ffe1ce874fd28db3ba0 SHA-256: 64836cf8bc41e1ab8f9e8917174907e275e1440833d737a55a66a9825e0e7d51
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=manual+do+poder+judici%C3%A1rio+brasileiro PDF link annotation
    • http://gleneaglehoa.org/images/file/29250456184.pdfIn PDF document text
    • http://rts-3.ru/upload/files/38478186360.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c476d5562---62734052171.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/govezijakoziwazejibaduli.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120327611346---xuzeso.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/76454866495.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/karudi.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/kakativiwologomufukagid.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219115344536.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/23509668776.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbce9ef74d---nusilaperituravij.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d6bb0f68---41286442104.pdfIn PDF document text
    • http://anysoldierfundraiser.com/clients/a/af/af293656121fcb8b60a8c910089dd81c/File/nolamifija.pdfIn PDF document text
    • https://abeess.com/userfiles/file/pigigivubavidut.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/d7a9vhjqddqp2s3bb91both18o/vekitudolijagex.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/bizigubuk.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/fabepotikixasaxaz.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/jafito.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/2412031307.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/9310136186.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a655825ceb7---zuwivafivilaxumoxirem.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/nufevubatupejuzi.pdfIn PDF document text
    • https://buka.ru/sadm_files/72811438558.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_off0000dc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9A 21140 bytes
SHA-256: 012ade9e2e182e49a14419af0c5b566cfdf2e5ef969dcdeacabe73ee2cf5cf44
font_01_sfnt_off0001116f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 10952 bytes
SHA-256: 2df8f4b51e04ad5b269af7608fb53f3844c59521f5899b42ef30d1724f0cf80d
font_02_sfnt_off00012a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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