Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f4f19c176c1778…

MALICIOUS

PDF

88.7 KB Created: 2021-09-18 02:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 24af15294bc68acb70979707fa8c9b03 SHA-1: 424dd8da7b7dc77d9af7a4ad725c6849407e9edc SHA-256: 57f4f19c176c17784b2c1df5300f9f49eea7b27f370ebd19959116b3a2f3bfd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ozdermusavirlik.net/userfiles/file/nunare.pdf In PDF document text
    • http://sromedical.com/file_media/file_image/file/vetazefut.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/dikojig.pdfIn PDF document text
    • http://hidropro.hu/upload/78015586431.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/forekenogewemapifasox.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091623090373499.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/suwinu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b757a1ef7---80094366500.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/30162943239.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/dg6c0phonk4u8cj2oqdohlo7f4/xejanusefudomesoluluzew.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/47397210744.pdfIn PDF document text
    • http://synfarm.com/upload/files/65065084501.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/79088411852.pdfIn PDF document text
    • http://agmapure.com/upload/files/xakupusivigaroseva.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/80658335638.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c6fe24355237c9364932c06fe39a91e/47250981492.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff5b79ece9---lasikogi.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/wiranafolakagagugebelim.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613661b715d9b---kipubefosetodejetevukusiw.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/59401368245.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/bisigemesivolasozoba.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/jupinikepabufewapak.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1a0458f8a37284942f9843d28a9cf0d9/rogixibudobenuka.pdfIn PDF document text
    • https://armenia4d.com/contents/files/99220131125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=adults+in+the+room+watch+onlinePDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD65 18316 bytes
SHA-256: 88d75eebc325361f9ce0f24d43912fa75f57835f09699e11fbb9d4bf2d179a6f
font_01_sfnt_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 18024 bytes
SHA-256: 2ae8d95e2f85dfcb271c8eca0e62e3608d05cf164eb5a989630eea31740fa50a
font_02_sfnt_off000129a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A1 10804 bytes
SHA-256: 16a82531aef1f85c2400abf7dd484a06be6ca53e2f6ba031ccc26c1a0c701ec4
font_03_sfnt_off00014268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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