Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd180adc0bad742…

MALICIOUS

PDF

91.9 KB Created: 2021-06-28 11:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cd55b25c5ccd891f07280d108577fa2d SHA-1: cdee3c45e1d43c181d3da6b17941c7be8a912edb SHA-256: 5fd180adc0bad742e06b5f86a51b1220f20040f8b9def8aeac819c94d6b2f2a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=santa+claus+is+comin+to+town+year+made PDF link annotation
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1bcfac9dc2954ecfffef1efeddad5204/34525094925.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/gitonumapizimikowix.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/wexasirapubumu.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/pibetolezejiwajikubos.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/vititabifebojerusikomuj.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/xezaj.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5558f38d---32607613494.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/dovaxovasal.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/gixapebab.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/35100db68aa7f26116b7d919a7d47adb/1079080566.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/99431243059.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/42804610568.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/55634902003.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e12a987a14e772d19f5c7b292115cd34/87982950371.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608658b6d7bad---57933499778.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/8a6f5bb5e715d6a270cd28dd824d8279/5638371142.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/61271533526.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082071730e2c---26437514671.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/sezaruweji.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/bubaxoxapinemom.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/36182622368.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099acf94e2ba---bosum.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084b58dd2994---33792729712.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/62160222967.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609eff2b522aa---jolanedizaluzezob.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087572c6261c---85464811453.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/54de327d2cfdf579986084827a49d2a0/49918869660.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_off0001039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 17328 bytes
SHA-256: a5d3f678c0514775e466ed19843fe437d96b94525b0df57b00d2c01fb45496e9
font_01_sfnt_off0001310d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14924 10908 bytes
SHA-256: 00847b51126c8a92cdb8c918ac88b357c8d56ac5995b3a604a6342570509a915

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