Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f36815ebc19501f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 07:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ffc07e917b940a77ec082ec204361a7 SHA-1: 010245ae406f53595e47e7b327a499d5db1771ec SHA-256: 8f36815ebc19501f9af8a6a5e6b811900c2b67b46f40f4006d5c8a2825e2b63f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'utm_term' parameter in one of the URLs further indicates a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://infrive.ru/uplcv?utm_term=7th+grade+reading+comprehension+worksheets+with+answers PDF link annotation
    • http://kondicionery-ivanteevka.ru/upload_picture/file/morafofogugajibevatiwu.pdfIn PDF document text
    • http://herve-coiffure.ci/files/lerepodonivudevakepuvot.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/43417071542.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/115bc0e5411eab30f493ded95c2e9f2d/wigatuzuditebogigivesusuk.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b45055b422e---73577977683.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/joxip.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/13826889730.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7f0d65894006dc64b5b7a4b6ab87c061/27445261589.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/wejijezasusatugipigovi.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/9e0261a1f9f967b2872f0b9d48de8fe1/77882806427.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/36825478754.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e3ba0d9bd---59928398633.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a34e74847fb5e3d376c4531462c071e0/papabujukelipoxonupe.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/watinujawedepipijog.pdfIn PDF document text
    • http://tfforming.ru/d/files/balobekoviwagir.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210828164035.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qkmj3k0aomt6gi8o81b58c4m74/33041920447.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d0976991fe7---sugiparozidijedade.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/riwoxevet.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/vojizifemodal.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/57801124422.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081c2529f3ea---89495454001.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4dda676fb---92797099773.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/zoxoda.pdfIn PDF document text
    • http://oembag.com/uploads/files/202108232308398364.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kunepevezone.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/51510713080.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_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 11044 bytes
SHA-256: 73fc408e4c0300ba2859933b9497b35fcf746557c78b7abe068d30377a585d20
font_01_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 16776 bytes
SHA-256: 01fc5a31247360cc94c9382b213da5401f00d4a628b7bc87ec21aef6444a1e38
font_02_sfnt_off00012831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.