Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7a2357785ac9db…

MALICIOUS

PDF

75.7 KB Created: 2021-09-05 11:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-04
MD5: 6ffa9a0bb0cb10d46f2897653d4fe157 SHA-1: 07acd5c99a38a53c557ca79e8fb5f184b630cb26 SHA-256: 8b7a2357785ac9db4eb94d8d3dd37b72f16497797dc98dc20e9806fe6a03b75d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous URLs structured as a link farm, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the phishing detection strongly indicate a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080dffd1d0f7---vusajidotuvelisi.pdf In PDF document text
    • http://zgic.ru/!upload/files/56978408664.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608686d542262---juninokoluzukasivedesuxuw.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607212d50669e---lipokedemimiweme.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c162d619---2838032699.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/27475045831.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/36110316989.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d9f6d1c14---kovobokuxutijovevawize.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9b6ac88ef2---kasudew.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/piwuxopabesumafoxovix.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/ritisu.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/borazifibuzobuse.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gopawadowaneganubugu.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/nufixilurotutamak.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/85049644913.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/69e11679d614b4580242c4f2e4d0a84a/44880417997.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/fc436122d8d1af74ca501a3b6622c989/tarurabinogij.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pmvh2vg6hb2mmasvqjohl02peh/wibimewox.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/pegijuzavuxigufokijik.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/31jtdtcn8cfm7mpdbe4s4gs9bvl6fi69/teneluri.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/50568070588.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/desekipe.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/2980987956.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e04f27ecb---laxebapebirukasekupinep.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/79241262225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=division+word+problems+year+3+worksheetsPDF 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_off0000c56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 11328 bytes
SHA-256: 58c19702196613777fc57182da3bff52d8720a1571617d5a1bb5043b10aa297d
font_02_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 15852 bytes
SHA-256: 2d2968f5a4d47d18140aa68014473f201cd335b0ecb957d8a87e8e85c7de23f5