Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c45f513d3a3d6e…

MALICIOUS

PDF

72.3 KB Created: 2021-09-04 17:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f8fd1e649a66af565aa9d66ff6fdfd0f SHA-1: e701cc8e7930d2e25b8a3b0f4d0eb7bdbd0b2a2f SHA-256: d1c45f513d3a3d6e2537e7b953ac120945ec55623f62a1f866dda1fcd2ae29f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=the+work+worksheet+byron+katie PDF link annotation
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8d65c1caa---kamefagezikimi.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/54421641055.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/3096499104c65c79550d4b5e94b0dd8d/momanikulagek.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/kalupamarobixiwunok.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae3471713e---23886899844.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/5fc4032f61e1a5b91126da00a3a12e0e/77017130381.pdfIn PDF document text
    • https://ms01bet.net/contents//files/nenetinomosawotokibox.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/bizegedopobiruvit.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/67848292834.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/deketitoxiwowolenedatapod.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d4a057680b5b42cf3541bdd68c7627f9/limifekizabanubinetojuk.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/revipatewopon.pdfIn PDF document text
    • http://www.toptehnik.si/images/ruvigovexo.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/fexejivebilemimotixos.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/99890531825.pdfIn PDF document text
    • http://imaginove.eu/data/Files/3997898324.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/pipuregifarolapasokamagu.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/vuwidofozojazoki.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e80d807be3---36795110070.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/61971067f61713e3db3847bf2f0a0d2f/48177152686.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/54753766415.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfaf0f075---53585759942.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_off0000bb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB16 10556 bytes
SHA-256: 19f9c3e1050065d88c772349457844d8308f3cddfb77dc57a78252bc3f7b7b62
font_01_sfnt_off0000d340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 15944 bytes
SHA-256: 7b636d6d8abac2598b03df60696c158c2d7050a26fc701ba0ad688d89fab2c86
font_02_sfnt_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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