Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc39c5df0ea509f9…

MALICIOUS

PDF

86.4 KB Created: 2021-08-13 21:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ebf457c6303b4d724d2d4f932d3916b SHA-1: 41642cce15eb8a38c3de71ffbd23ce178dc67b29 SHA-256: fc39c5df0ea509f984e05e9af498ad90d04ceb1cc4136d4fbad0fa2d8f20065f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c8ac5482e---lujazikukuj.pdf In PDF document text
    • http://lyzebrno.cz/userfiles/file/70300485192.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c504f639125---vesere.pdfIn PDF document text
    • http://yuha.be/_files/file/fubixobajo.pdfIn PDF document text
    • https://o-dance.com/upload/files/92818755227.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160fd990306a38---21023587924.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/bokijolidel.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/zepogefetilopezu.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/pevisulagibemelet.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/dozixokanuvunowob.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/puvigafudagawiwepume.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/49181379606.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/35677579107.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/furuwaduwifi.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/10607222394.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/70173141956.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/xesanudorada.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609bde96d6f62---76806722373.pdfIn PDF document text
    • https://starbox.fr/img/files/vupupenegunamoguzipojude.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beddcd6a407---dexumizidipidaxovugirega.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/33757220848.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/55334840474.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/c11ek6hsji6h82s9mpe2338a59/rupopavesovumewusefitid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fichas+de+restas+llevando+para+imprimir+gratisPDF 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_off0000e902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE902 11004 bytes
SHA-256: 6c8de0818c71c1085d07b6cb7cb66839a38180f9e603bf2fd1d2937d2a5b1613
font_01_sfnt_off00010236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 18756 bytes
SHA-256: 8ee8b283ec0e1984b9ef21d3522bbe9fccfced13e8d8d17adcc0a6941a6b9cd3