Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3e26e07efb3ecf…

MALICIOUS

PDF

86.2 KB Created: 2021-09-13 04:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cac194d5835330ef6bc77c1eea08502e SHA-1: 3ebdc09946eeb080f7d6f80200a88bbff3cd7860 SHA-256: 6b3e26e07efb3ecf81014b8a62e04e2837f3f54182e8c51fab79da057a7ae905
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body was unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate the primary function is to redirect users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://rajakeempat.com/contents/files/zofiwatigivubuvapesuzubol.pdf In PDF document text
    • https://r4binsh4h9-att.com/contents/files/zamef.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/18557448364.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/dulefosojiwegikilubizod.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3b1gmv89ppoq8b5c12ahu798q1/faferiwuvowesid.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161335e73548da---furebemotoguxaxaziwi.pdfIn PDF document text
    • https://grancom.by/upload/docs/wogurizofadasujev.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/tepufagirepusotuxodina.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/86768162632.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/12750255015.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/loxofujifatasotilokufinu.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/90798097559.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/zominezasewopaluka.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/62713798323.pdfIn PDF document text
    • http://langyupharm.com/upload/files/vutomepejidiwamajose.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/48844182220.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/kozarikawebapubitatugizoz.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/gasoninagogoxulejalibeze.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/45173d3efa9a77653e0f80ccccca3837/11738584318.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/xokuvo.pdfIn PDF document text
    • http://i-physiology.ru/upload/21691667894.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/sapuxamagogipojipogekowad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+feed+as+vampire+in+skyrimPDF 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_off0000ea05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 10960 bytes
SHA-256: 07d6c4885da22953a71941d214e469ac773341fda0e5730888aed6172b278af3
font_01_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 18640 bytes
SHA-256: 118a1eb66f6cf2ee22c24e18ae8ca236150bdade8325563661667bd17376448c
font_02_sfnt_off0001337e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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