Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfcb19458bc8cab…

MALICIOUS

PDF

103.5 KB Created: 2021-08-12 11:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab83436c8e2482168a79bf610c9cc249 SHA-1: 5dc2811defeb7f0004a8f1726050ea8ea4b9d40b SHA-256: 6dfcb19458bc8cab97b2fd16203ee4e5c8d866d1ab368fbc1a560737cb2bd622
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://synerhu.ru/uplcv?utm_term=alfred%27s+essentials+of+music+theory+answer+key+pdf PDF link annotation
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/fa9a511497632a37dd214e7c1d062031/nasumifafedukug.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/44316586964.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/65ke6811hm7s9o1kdfpgdhmd40/84807797242.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/1429878fdcbd6b2ae82b68dc00b947d8/todapilobedeti.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16083acfeb6bac---47619120186.pdfIn PDF document text
    • http://normel.org/files/upload/file/vilatuguxe.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/toropolekotaf.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/29603722141.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610dc047c008c---nurujifasutajamixila.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cf79c5793---zinopizujakorum.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/77038463640.pdfIn PDF document text
    • http://atomleasing.ru/media/File/nukunelivetopisifoxepuwin.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/karepikokupotowerane.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/65418329296.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c03c4c4ca6---riloninibutuzug.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160810ef2e031b---movavowadodof.pdfIn PDF document text
    • http://rld-carbon.ru/file/resikelinoxawiromawedowij.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/c9f5a1b7bdf7b91479c6a14e70ce2184/lamobasipelikukojimu.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e6856e884bf---23495018255.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/49080528459.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/fajedovufuzojoxifizupawi.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/dezimemirarirugomujem.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/71545740758.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e95a28fb37d99785fc13286feebbf42a/69610209680.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_off000120bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 26588 bytes
SHA-256: 9ba815e46c0c0349850e2499d9c327d737fdc2bff9c3a6b2e28a0d6615f5686d
font_01_sfnt_off00015a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A98 11292 bytes
SHA-256: 8b94f7a604f81a604ee582364165f6aa5d8041380117752321a0fd62afe39078
font_02_sfnt_off00017513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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