Malicious PDF — malware analysis report

Static analysis result for SHA-256 93224b977204a925…

MALICIOUS

PDF

83.7 KB Created: 2021-07-21 11:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 699bc26e79e49c8cc22778b2041f8774 SHA-1: a8f712e1c7eb96922a9bf36a58e215ad0a8d14ab SHA-256: 93224b977204a925fd3c03a782ea955ffe399c0c554a2f2628974aca25b7a919
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://powermailer.in/userfiles/file/bodinupokavelogot.pdf In PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/v28ft9cth7uh23ehmotgurvbno/49383602734.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/30611025082.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160805d76d91e0---73318975461.pdfIn PDF document text
    • http://landpas.pl/upload/file/givejevulififeri.pdfIn PDF document text
    • https://highrise.pl/file/virojabozu.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/sl9vfpbk9rm43qjq2jkb705ln6/lilorekepazujukovapuzo.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/2594bb1d8c7a3e9f208f479762d9c79b/popazo.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/putagilajuwasud.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/f81junbtgcodud4mq8je3cs952/89116294314.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/66652468395.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/3k8jtvrtpq0uo3b9m3ebp9raj4/bivezomedafi.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/61955461855.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/19543112880.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/pazizufojuk.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/roxasimigusenalogas.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160854ef2a5177---93112663126.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948d341a94c---gikaguriwanejopagagubases.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/23916134801.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607751e31f38a---72265890060.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/malutirepedorun.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/66b8909a33fd6b4ba77cdbfcf68b2e67/41212097320.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bb6a34b46---dikifinapagud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=eligibility+categories+for+special+educationPDF 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_off0000e2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 17088 bytes
SHA-256: ca15f8ce47e83f78f98f2c5a2a5b5cbebeda3f2d12c5a7b7273ee93d016b0ce3
font_01_sfnt_off00010f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 11132 bytes
SHA-256: be5f4ebc5b1aafea593309b77aeb841a4908772d878c9d0adfa8c3628197fe7c
font_02_sfnt_off0001295e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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