Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a4d5bf998841c7…

MALICIOUS

PDF

94.8 KB Created: 2021-08-13 23:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 757b185ff6d67ff38124498aec0ea67c SHA-1: f934ae44b244388bebac82acbb1c8b144a1eadd5 SHA-256: 53a4d5bf998841c78df728c556d08052f390fc6236cba31b31025f1dda18bb7a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content or phishing pages. The presence of multiple external URIs and compromised CMS upload links strongly suggests an intent to lure victims to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://garglob.ru/uplcv?utm_term=how+to+pronounce+french+city+nice PDF link annotation
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/gulhthqdle97splq9f5c9gg3me/19320473685.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/sibaloto.pdfIn PDF document text
    • http://nprofit.hk/userfiles/35486223458.pdfIn PDF document text
    • https://phr4u.com/files/sipixaberifaramub.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/26db0327fb043332f3e1ff9193e0ef14/46413295598.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0fdb124be737c08dbbe1d65021e09d93/93081436515.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ea608b47698c39817382debeb39e7a98/vuwetowujibaw.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/53753890086.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c67425eff2f---77109342863.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/57153604985.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/8540779bd51e9cac0ad7aaa4164df814/43667315889.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b84d772447---29738334140.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/nutepevabu.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/nogumufus.pdfIn PDF document text
    • https://goldenapp.net/file/fubebofiwonadusakapogibe.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/1esatrvplbkc1ic2f7tu55tlj0/8785937654.pdfIn PDF document text
    • https://avela.md/userfiles/file/wubosapovolotowejil.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lekojovemarizejeg.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/latoso.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162688190840483563412.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7f1c9d473---15281761781.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e7e574271---68097014585.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959469bd5ad---sagedaja.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608873020e02f---30483063221.pdfIn PDF document text
    • 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_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 10492 bytes
SHA-256: 1069efbae4bdccc8fad5a0943e921800d18b38f2b96369e8f2752a586df48d13
font_01_sfnt_off000124e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E8 19096 bytes
SHA-256: a714fefa2ec561026d2438ab47f086ee3d7154fab9d1b88d05506ed6ea3983be
font_02_sfnt_off000154ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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