Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a005a8c8943bc1b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 16:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d0e557779c3cd6bec77f966711a468a6 SHA-1: 5b90ba3ddb71e9f45edb7244a25adeb4e0fec46a SHA-256: 4a005a8c8943bc1bc78b0d04d7c96077928a630698a8c5a048efb29d08c1742a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised WordPress sites. The presence of 'utm_term_redirector=True' suggests an attempt at SEO manipulation or traffic redirection. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://orsolyajuhasz.com/ckfinder/userfiles/files/tatisoniramutumawape.pdf In PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/f231f494dd4e9f09453510070cd8642e/20241267390.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/c57f1e20600a69623cb4b8631c8d87fa/pobujemokejiboxubuz.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/a96de34130496ad90c475ffd9bd8812f/wakazetejalasedem.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c935ab84cd1d769ada66940d3e999fdc/270243040.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089ebd7a6466---86466123807.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/tugedudojuputugefif.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/92071112804.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/45807498713.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/19869523498.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/4851261717.pdfIn PDF document text
    • http://xn--b3ct0dc9bc4a4g.com/userfiles/files/jebenusawopex.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/zonilarirubonidazox.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e819d4758be---23878294952.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cb99099c1e---27228341745.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3b7bd51f---30863344183.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/lj2l9ttoatke813vdgmpbajdho/nosovuwizimivad.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cbd950e94---6606750740.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2e4fb2b5a08c9e58086910adb9480592/garibilowobok.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/40216535716.pdfIn PDF document text
    • http://domario.ru/userfiles/file/jabolazifisa.pdfIn PDF document text
    • http://beta-rc.com/upload/files/28176284086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sharpie+art+workshop+timothy+goodman+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC71 11268 bytes
SHA-256: 66f1428f76ad42d9f7cd2a97e311eff455ce0965949d90672776256b002f422c
font_01_sfnt_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 18596 bytes
SHA-256: 344ea887f9ef7fbf5de03c52a3931b9b98799109e4176bf6532223e6fb2a6ff7
font_02_sfnt_off000116dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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