Malicious PDF — malware analysis report

Static analysis result for SHA-256 edbe26919aac1f5c…

MALICIOUS

PDF

90.2 KB Created: 2021-08-03 13:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2ab1366500a67348a2a386643a933ef5 SHA-1: 99025b83d1e7fe2eb7df4c229ac2590b91d047a5 SHA-256: edbe26919aac1f5ce10c07addbb27b5fcfd7063d0753be6bf85b50dc11d32d7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or appear to be part of a link farm designed to obscure the true destination. The document body is unreadable, but the heuristics indicate a strong intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://rauvuonsach.net/images/uploads/files/53345826086.pdf In PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/nljnkjrj3r15tueh67lo4madr9/nipafer.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/67dd037d1eb80fc7f796d3c8e61cfbe7/popidop.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b481e97b5da---93948075668.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/moxofawigizuzapurutob.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/wuzupepotebipabitafirixek.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792d0a280e9---dukaxatokevuz.pdfIn PDF document text
    • http://aven.su/userfiles/file/45132630883.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160761c35db694---vovurozutofenav.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/91040420829.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/narobokovixalenoba.pdfIn PDF document text
    • http://pinxedien.net/upload/files/xegulef.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/sldiffb4hnnr10d94br841sbva/52590000305.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021052518153873499.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/tejizexitilipigoxizit.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/6ffb6b4912fcfe012c206dc62d6f7d90/81419239992.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd26b3797---zifunijuxagatatudi.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/dowedebobolowekobitik.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d815aa83e96e53e70cda8e9bf154b3ed/79478384823.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/63594415585.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe517dbafc---memotinivunaruvu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082aba414688---sazumodefilubex.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc92d8515---7802811785.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081fac93b00f---fomanodifonusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=can+you+drink+premier+protein+for+breakfastPDF 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_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 11088 bytes
SHA-256: de7b109b44733256814fc624eb24a4f96e24fefe20f0523c3b5ce5b6c220cbcf
font_01_sfnt_off00011337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 17940 bytes
SHA-256: b0e600593d91c67028108b7c61a8c37eb57c8aa0046b273cff3e67c50993b22b
font_02_sfnt_off000141c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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