Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fd5c2dc6dafc2c…

MALICIOUS

PDF

83.5 KB Created: 2021-07-16 02:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2d28d9c7bd0c1c14e70103b2fc582387 SHA-1: a618402539298e673f730fdea79c0a65e40b9175 SHA-256: d5fd5c2dc6dafc2c6ddf3b608fffceeacc0b121fe649323f79c1d1c10c6d4dca
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves directing users to potentially malicious external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://caffedisanto.it/file/13596631534.pdf In PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b2919e15ffa35f8d70e8e181f2a63638/47030531145.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086d12ed2398---65877091453.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be52a6bf1e6---42037060562.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/xogojilizureponagunam.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dafbab623---xukegekorokugutudezidusi.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/62923765041.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/kqrh4qh910s719ui3ltrb5s2r3/86379540164.pdfIn PDF document text
    • http://fittbike.hu/files/file/42975272444.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee9b0034ae---26871398089.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/bixovajetoda.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16088be79d38d8---kekabiger.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26e87091d5---88060926651.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/wubalalutar.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/bonuzikoxemebibijezom.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160791076d462d---86673327242.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/bajinipimidaxowefi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/regan.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/u1bh60en32qqhbton098l2g2l1/duvuzurejibuf.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ea75129528522858bdd6e4682325b6cd/54424209324.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ob0smqba6o0ntp6v20kmr8ag2q/pazefusakimimuguzositesi.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/kunemorat.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/pejn3ap6gtkuou4rdsi6g6o97j/fomakozeg.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/86488957360d33e7acb4d4.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/zefanabofalajiwipafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=soccer+possession+training+sessionPDF 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_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 10580 bytes
SHA-256: 2110b813bde7f1d05a012c3463574b143cf900f167d629ff250f9f1ef846e594
font_02_sfnt_off0001162e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162E 16356 bytes
SHA-256: 2c96314534bc77e398edd1400937cd660fe0f9c95ed325fe074e6b936e2e049b