Malicious PDF — malware analysis report

Static analysis result for SHA-256 5975b1839b8750d6…

MALICIOUS

PDF

74.4 KB Created: 2021-09-08 07:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce2d8324132c519247035a1eeb91b4d2 SHA-1: f8a4bbd8ab256acdc97a880284bd12922088a6a7 SHA-256: 5975b1839b8750d6ab5faf1e9f362ee77d5bfe291c83e0b36246c357c4a39095
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, indicating a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/67404313850d67c715d16bf981c2aabe/86186919647.pdf In PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/benilanata.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d87da5fd280110b5a128a561cdfb8ed/59948348144.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/47038626227.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be327a85f0b---rududelusajovimosi.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/pesewojurofek.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/5095755960.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/xugujowitifelog.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///rizogavob.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/jamogewepipo.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/ad195c90ae359edc694abdbfb78114f4/mewabemukenipiwogalojuton.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/74347218873.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/kexivemu.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/jukabo.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a637a4f74c---82135521805.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ec286b68cce2aa42bf6f4154cd7d4b05/71196304913.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/30797244911.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/36280646316.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/76065767292.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/9b164e6405bcf4aa782f578c8809e9c8/baguvosejegajijikabilata.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/59173666476.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2be5637dce---xupojevujavuradirom.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8b24740bdf6856293ce0f73b02f8f7f1/sibibutejuvotojigupun.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/30357607035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=strength+of+materials+problems+and+solutions+pdf+downloadPDF 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_off0000c0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 11344 bytes
SHA-256: 5de42c8fac9d38ad541de63d1d57ce4d02e80f485f615da0d1149226fb069206
font_02_sfnt_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 16012 bytes
SHA-256: 916b0bbff88da37be59daf48823b01d7cdd9d24286a4eb00ad3d5204d53c69ac