Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5b8b70843fb2c5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 21:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb62229a76bad2f3dc7a8e63127f822d SHA-1: c064ae2574ee9ce0979538f786f269d32ea447b0 SHA-256: dc5b8b70843fb2c56860b6bf0cc4d246cee722120ba69fb71b9b283600f76399
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://reicar.dk/userfiles/file/63546797651.pdf In PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/jokula.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/39889179117.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/52238044076.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a56d78413---daxolijixe.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/botobaxudas.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/18897300871.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/jmphi009fr9l3mhvfv35qhpqi2/koganagojigigifasup.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/53813725398.pdfIn PDF document text
    • http://yongqingtech.com/d/files/820626689.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/vajiw.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/lesaxilipalubakugafisedod.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/pewavef.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4191f5e1844ed84bb48e06ddce3b434d/danigifi.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///witadu.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/julagaxafumazavimukotogi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d82a8689e---14174738486.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd5098d9f8---dafipakutejozekiduguxilav.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/61569501893.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc72d4812a---74563059224.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f2accaae0624910836374fd600ff3528/pefosok.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/danexugomexoligiv.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/t0c7kmoinlofpdadko48spf1gi/bafuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=trusses+nptel+pdfPDF 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_off0000d962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD962 16828 bytes
SHA-256: a904a0c7fa6c9d68738036af2b8c2d231343797b7191b63ad1b66de536ece89f
font_01_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 10180 bytes
SHA-256: ac09e6c93b9ffb5a671eb5021d23206cf4e2af07c0d3fb6f1797b66e719e8542
font_02_sfnt_off00011c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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