Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddd6cd3110b2bb3…

MALICIOUS

PDF

88.9 KB Created: 2021-07-24 19:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8d38d3d173868445bbae8f045e4d2c6d SHA-1: ec89581bf81630fdd550e802a8d9dad43a360ad7 SHA-256: 8ddd6cd3110b2bb309adbc4907332aa58f97f861b1d8c70f66ea569d8f7a91e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content, likely for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://emons-verlag.net/testarea/cwsCMSlight/media/files/korijafuw.pdf In PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878688eaa24---32698159743.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/59077917051.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff9f1e0f4a---rikaganakedubaxovopajoti.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/22338119181.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df75b7e101---kurevomurari.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/pq465h55neqcah72ntgmkeuo4s/49265947270.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/pamusuti.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/23761989748.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073f1634dfef---92264503947.pdfIn PDF document text
    • https://sealskinz.ru/files/file/worazi.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e6aec24fea9aafab3e83426998dc41cb/50224501206.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f31a38495d3166b84224f652ff5d839e/nadupun.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/balis.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb66a30f5---laluxigitavokid.pdfIn PDF document text
    • https://ms02bet.com/contents//files/68665968195.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/13782570238.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/f68a55e9a3a3e369f8b42358d46d985c/rofalepakozurol.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/pl4s9nogcn2e3aj3t09o47pad0/37864455406.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/98cdde640ab52dba5c5cf701f9e8c260/wafukuwefejamumubiwanorad.pdfIn PDF document text
    • https://mfdesign.hu/files/file/82719614800.pdfIn PDF document text
    • http://myphamasia.net/upload/files/nerapixubibimafotiwidepa.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc3d9abe1a---14142732927.pdfIn PDF document text
    • http://aozbt.com/clients/3/33/335f642cf73e2ad82edc7dd4a76dad4e/File/29173816025.pdfIn PDF document text
    • http://sooclose.eu/upload/File/41491519529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ikimono+gakari+blue+bird+mp3+matikiriPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 11020 bytes
SHA-256: 72e02e66827d766ca24cfbb54af6985ef1de92222e2fe1ccdaed63e639fe14c4
font_02_sfnt_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 16368 bytes
SHA-256: 49af513be5584b63ffb3764bee6623887ad08f97da0f4f962e57d3c96009cc3f
font_03_sfnt_off000117ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117ED 24672 bytes
SHA-256: 043881599a3d45e51af502e8a6ebe98ea4d0f1394d2ac8b4be1edca6c09ca73b

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