Malicious PDF — malware analysis report

Static analysis result for SHA-256 545c474e54fdcf8c…

MALICIOUS

PDF

80.5 KB Created: 2021-07-18 01:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 486203e4c0ddc40d71e930fa1b182f6b SHA-1: 486a4d9374fe902a0c960f6d135163797eaa0353 SHA-256: 545c474e54fdcf8c7f41acde7c957d7a30c514760b1e9ac29986ff8dda8ad309
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 directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e80bb2196---wasujudawivixis.pdf In PDF document text
    • http://www.knickmeier.net/images/pageimg/file/92231547710.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705c15ee5e1---pukenuzimirawekikeja.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/vinep.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/5e17dtc7470kcthj68d7ajhlk5/88229880805.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/77342741366.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/829635dd1befc458a25d3d142f0f90bd/85264254195.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/20056021825.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/2559804131.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/1845712600.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/14858064348.pdfIn PDF document text
    • http://nensi.si/upload/file/22472073829.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160894c14cc7da---lofipapos.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/95775685364.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/52c2817ac90f42465711e98b33a2e7f9/foxurupikuxegijiw.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071850ebbac9---vuletopaxubuzos.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/fdcdb36cd6bc7a982652039adf4c3f46/53052786593.pdfIn PDF document text
    • https://vestol.bg/files/file/gavepedewavig.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/2628485230.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/41971783762.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c23d376f4dc---koxipenebamupaka.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/3af036riatlvguj76pme7rtbp3/vetosigexoruwe.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1984166ebc---pexuwanusuvukuronixalow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+europe+underdeveloped+africa+pdf+free+downloadPDF 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_off0000d5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F3 16956 bytes
SHA-256: 0219e31bc875798341db99152cb8ad84f46562665da692a4aa6f3e16d939cbfb
font_01_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4C 10588 bytes
SHA-256: 8a58de836ccb2f5fd5cc5bbdece15fca38e3055fd6da1aad5cc729a55c4204fb

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