Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d52f58d8287d1a…

MALICIOUS

PDF

99.0 KB Created: 2021-09-17 20:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3430eea1ef6ccdce354f4e7cb06ede1b SHA-1: b55ea409f7964b29207c8cf80bb022ff336c2a46 SHA-256: 79d52f58d8287d1ab01c87cec4439008fb349811c12f7eb7ba982c0179adc2cd
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it contains a link farm pointing to potentially compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while some are marked benign, are part of a larger pattern of suspicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://naviway.su/upload/files/loxudulegokin.pdf In PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/tonudoburenadoxapuz.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/viriwemafixatatewo.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/66574101829.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/vulipebajusefuvirasoli.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142c4baea4bc---xoxunebasukoxovaxol.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/futodovegalamo.pdfIn PDF document text
    • http://scro.ru/pic/file/gebiwuje.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/rakup.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98563b8d1---52963299216.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/biziwovuvovaxakusupuzuf.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/87770743176.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/76770651295.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613646669b7e1---28265355900.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/oviq11tte25dtlf1nh9ic6a9v0/35327402073.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/zagumanesewuwizexajomob.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613905cd5699e---puwusawezukogebapenek.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/rokobeviwowef.pdfIn PDF document text
    • https://alpinashop.bg/files/96683559518.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161413ba7e1e2a---61472270002.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/kigukexajovatiku.pdfIn PDF document text
    • http://teresachild.com/upload/files/28366457485.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2d988a68d---lixobek.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/fobevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+walking+dead+android+season+2PDF 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_off00011cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDE 18904 bytes
SHA-256: 4c694c2b333399784b6c334c56dcaae0e5dcd2f89d185171cf46d8bd3487ce2e
font_01_sfnt_off00014de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE4 10688 bytes
SHA-256: 9321ed895ff90eae23e64153947a45de9f5bc7f5cb4a6f08a460e0e5f2b916d5
font_02_sfnt_off00016634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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