Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a08303060da2e7…

MALICIOUS

PDF

81.8 KB Created: 2021-06-26 06:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1353323e3c884c14c8dbc57bf0602584 SHA-1: a9f1edc57fdba70af19563043ef254b6c7e441cb SHA-256: 29a08303060da2e76eb0e969cc119ec6139570ede3f82ddf90e6e8a2fdeb86d6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings confirm a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://agrilaui.com/userfiles/file/retadexijiwe.pdf In PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a38e41d9ba1ce37b069e5034237e33bc/31671119420.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/u10jgmolp8ffmn0boelsour79d/zuwujifadigeka.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160904648ef92b---mivokesam.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a70cd3e92fa---97030451495.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/nojidagofafufabobolozaz.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/23b4c6aaba49a75251a213905c92c46a/gunanitivuzegitarizazut.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210626104219213031755.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/6046379370.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/nokugujemibiw.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/vodamabomofadojej.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92ea2c7933---netubimilevatevabom.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/njs0dd8j3jaglc1b6sqt02ivgs/lafuj.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/sakegaxilijilir.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/waxofixanutiwubiniwarubi.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609890c60fdda---rutuvemeregivaxeluf.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d27a5530f---87065560612.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d6e55c8c05f4688231e06406f11fb13d/lodig.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/e84f583ab4d1e700d65698989f3e4859/47437770111.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c70b5a96adb---lapar.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/lovadinirasuzelifugel.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830a85bbe92---puxepuneliw.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/0f27ka3n8c2vh8rk8v07078p99/kidoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=froggy+goes+a+courtinPDF 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_off0000d1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 10548 bytes
SHA-256: 5ef5f8b311de7688c60186f0e49b0afd4f2e910607d73ab243a279a1d3cee3d4
font_02_sfnt_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 22736 bytes
SHA-256: 71f45a352298fd8dd5cee3bd74241e34a9d49346d1f53ae08c4d2dec4a4955b0

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