Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c12b555bdf25031…

MALICIOUS

PDF

92.3 KB Created: 2021-06-26 15:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2749c2703abd1d9b5f91047bd4a3e952 SHA-1: 6a2b34227a04f43e8f9a2a2980f3b62a0db080c4 SHA-256: 1c12b555bdf250311a169e8b9868aa19e7ff348ae7b9154ca7c2bf5605fc3f48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains a large number of embedded URLs pointing to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malicious content or phish users. The presence of external URIs and link farms indicates a likely attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://inwebjor.ru/uplcv?utm_term=maslow%27s+hierarchy+of+needs+pmp PDF link annotation
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b3df477171c---13189530056.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/3e7098u3dbg8sitqas2bl0fmc2/72422511888.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/khunjvrvlqh3v2ufg1l5chr9d4/56888587211.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974f1fdda03---jagenofig.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/sewele.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974989e2444---17027789281.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d78f14002---15712306243.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824d558ff0e---15237086423.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/81732554617.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/gbu3ju0oalpt0bb0tln57fl5v7/4757648294.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97476cb02f---29159987358.pdfIn PDF document text
    • http://chapelguild.com/images/usr/rororolazemetaki.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b2f23631c---67221556510.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/vawuxa.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b063f7ea4f3---juwonimus.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8p5caopcmf4e91khm1ei7r0h5b/puposaxop.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/pt2uu577u1vsohch2mvfd3ms97/ninoduwegaxijufipi.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/luguweg.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/juxotezomir.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/72308292944.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c65ce6e9c---43832576269.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/46167204786.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/bezabigipikivezemoga.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/dukaziluwopa.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/9dda1acd277b2f019959ada27f5768b5/34272671384.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/uenbnprhq0s6kugioj7o0mpt81/wopitujewabetibomipo.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_off00010512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 17228 bytes
SHA-256: 8c7ebe54a479885a37fcd7c143bb24260da1e779d4a19051d08d82dd8772e87f
font_01_sfnt_off0001320e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A25 11016 bytes
SHA-256: 7b8cb71b4970c09c75c7b8857f19499da1ea2b8582c187f66a59a86ed2442884

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