Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef6e5ec173d6ef0…

MALICIOUS

PDF

85.8 KB Created: 2021-09-15 12:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c432ee4dd612e73453d959491c2db1f2 SHA-1: 7dd72cc37f74ac2ac11b75354c87a7aca996a824 SHA-256: 8ef6e5ec173d6ef0620aacdd8cfa72e37ba3860ac5230eae9c1981b2ec0cfc1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=hack+mod+of+extreme+car+driving+simulator PDF link annotation
    • https://mannoorpally.com/uploads/file/34210534455.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/doxirapiwek.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/taduwunizu.pdfIn PDF document text
    • http://darec.sk/files/files/32766130010.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/pademofovus.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/30124493253.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/11355725417.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/korewa.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/88afa87646b805c56ff5ee6b37d15996/59992048306.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/32688846220.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/85441796790.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/ninamujemafadezarazob.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210908124513.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/63367421948.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/folosidumajuteved.pdfIn PDF document text
    • https://suruburi.net/mm/file/72378036107.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff175c789f---javizapatalisidisikifawi.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/89478155951.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/83622229164.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135459f464b1---28694588971.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/39642471892.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a050334039---pisafegekugulojefo.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/6796554651.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130367b5fa5c---fafebobonerifolilatogez.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/tuwepejulosuxabemijero.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e077.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE077 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off0000c866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 22372 bytes
SHA-256: 435cc96bd22876318f9a9ac8e0721cb92e4c0b91f35050dc47778a0ac0ac1d7c
font_03_sfnt_off00012ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA4 11168 bytes
SHA-256: 9325d66682f176754a991758dcbaf00853a6b46aa0c3e58c2a37186881d23753

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