Malicious PDF — malware analysis report

Static analysis result for SHA-256 6698d1dd3f94ec3c…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 19:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1651ec540047086537efd5a96d8c11ef SHA-1: dd04ba9b7d3a79aa666e324670fecabd7aec2e02 SHA-256: 6698d1dd3f94ec3c119bc5dcddd39ef88999e8b6947e4c588a3a190bd8dca858
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/uplcv?utm_term=diary+of+a+wimpy+kid+free+download+pdf PDF link annotation
    • https://fleschimmo.lu/userfiles/files/vugofamujajuredeg.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/37252636208.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/76070482086.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/86109518103.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/61048741700.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/jaxazexedupevak.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e12ca5c70f---13586421774.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/luzudozapazam.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/satepemosilu.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/gegepa.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/dofozokorusosumo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16090640ba8475---sepeniv.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b146a9de07c---xiragifanojizenalukasaf.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1628603433.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/16802684997.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/zuzufugijamelodetar.pdfIn PDF document text
    • https://landbar.com/upload/files/temetulabisugilefomuj.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/54051462060.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/makajudasojemotepujegobet.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/kovalevasorobi.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b562a1853687f7aee28b94d638782fce/2155355587.pdfIn PDF document text
    • http://thedreams.cz/files/66407421573.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/63898494621.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/67496001774.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/6eaec1ab42130cf6cac1c64a0f27c78f/41760702331.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_off0000c4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E8 17268 bytes
SHA-256: b34bae5bc752abc007ac9d812a189e29efbb83ad868fc68e20698ad4cdf5aa2d
font_01_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 10684 bytes
SHA-256: d879b7c990912fa76b1e388b240a98e4b4e9b1c4808af21f1aa3d790f55fad0b
font_02_sfnt_off000109eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.