Malicious PDF — malware analysis report

Static analysis result for SHA-256 3432c6d9baae1f78…

MALICIOUS

PDF

98.2 KB Created: 2021-07-05 17:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 71d65925d8aedd0104cc427a70cd72b4 SHA-1: 2ddd605dce8cbd76ddd9b4b9ee75bb165d7766e8 SHA-256: 3432c6d9baae1f7813ce9f0ebf0ca03144f6ec90b8c956207d30259abf45c833
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://secolink.sk/userfiles/file/zeropupe.pdf In PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f747e01b93---89661751045.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/budubir.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/61661409566.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66f1c079a---23483665873.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/51773795359.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/396f78027b886fd9d21f2ccddba97233/26716561721.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f8f5cc98c---33899032708.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/24796177387.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/dabamevazot.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1f850e962---nebugokagagatikodajanira.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e223665102e---49127846830.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/4738644326.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///rezolomapatatajupesip.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/b3f318813a98c5bcb6e412c825beda41/43276541329.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/3482185201.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607776dc99715---68390537771.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/47369568026.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ada9386e748---vadotafifu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/jepifesalisegog.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af0188273de---55780059799.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/pududadufotaxisusabolat.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a155ca2a69a---81937772785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+moon+goddess+wiccaPDF 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_off00011f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5E 10620 bytes
SHA-256: 069164b508f3417e7777bc7500c3827372e4ded569bceffe3c12f4b412e5bc1b
font_01_sfnt_off00013754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F66 16952 bytes
SHA-256: 703995dbf07268f0d1c789e0e0f84db70c8de92f00ae814fa2e2e6f78ab20ebb

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