Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7da586dfa51c2f0…

MALICIOUS

PDF

92.0 KB Created: 2021-09-06 21:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ebe794275aa3de0a756ae85b31920d7b SHA-1: 4d0bd8a221e18b4cef8b53ff4592376972de8863 SHA-256: d7da586dfa51c2f0ecfa8f045dd69ea516ed6500434f99d2365932dc803e8391
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. It contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised WordPress uploads or disposable hosting, indicating a likely phishing or malware distribution scheme. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://net-marketing.hu/images/files/xedamamebukijuxini.pdf In PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ee82e37b---89515957353.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/34142822441.pdfIn PDF document text
    • http://eths1967.org/clients/6/6b/6b000f7c2bca5b3a89f93fde6b54c5e6/File/kunijewezubozilisepabe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613016a34d965.pdfIn PDF document text
    • http://chinazzjx.com/d/files/mosapogarim.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/bokomajepujodatuwitotabe.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/v6fc3ct9o6mcs0biuc60s0jhg7/mezanobakaleson.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/vofudilejexesevulonorave.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/mafufojazotiraja.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/tevamosexokabajupe.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071acec3e6e4---lijojata.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/39939330735.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc95c2da5---xakafipup.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/0een9u7lgchuu5tpb48f00sdck/jelazixakutupuku.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/26379562783.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba46ad8cde---razokuk.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d435b3de86---6033811478.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/7d6a6acf1501ef01e8349dffb048ccb9/wamageratepijemezif.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/75c9cd9bd0657c2a6f1f822ca18ffad7/20607589029.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26ffabc24a---93960980307.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/81198325295.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/zamodiwugododolebav.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/73ed5dec38d20280453c2656fbd2071a/bawamijawuruva.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/bc4410eceae67c224da61815133142e3/jixuvevixukesogigoxenuti.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/retaretibizumexeroxira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pirates+of+the+caribbean+4+script+pdfPDF 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_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 20164 bytes
SHA-256: 21f42718f604b61b2d1c2cefc883758ef20a0b6aba8db57b1e9dafc3f9cac01b
font_01_sfnt_off00013156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13156 10892 bytes
SHA-256: d9bb565e331bc2fbc6795fbfb0fa5cb58b4fba6f85259527f4b375c46ccaa93e
font_02_sfnt_off00014a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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