Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f1c7417b9d8152…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 12:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 221f84587bac4f8f1112725fc83dd6c7 SHA-1: d43a930afbecc68a1c6ce7ba18f0f5871084eb4d SHA-256: 46f1c7417b9d81529adcd712cdac42d7d8c1404c48cdbbc9ba5211c7402f959a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress uploads and disposable domains, indicating it functions as a link farm. The embedded URLs and the heuristic findings strongly suggest the document's purpose is to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=how+to+install+android+sdk+manager+in+windows+7 PDF link annotation
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/zovujilebu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f42922c73---waxudaxurunax.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387c34d93b1---duwakujazozokelulaxapimet.pdfIn PDF document text
    • http://xn--80aer5aza.xn--80aai5amepo3c7b7a.xn--p1ai/ckfinder/userfiles/files/tufiditelego.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/jimuxajigogixoru.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/mufafumigaz.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/78144427347.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/kiruwopimebikadigukizok.pdfIn PDF document text
    • https://redac.ch/upload/ledikuxonakumurewa.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136759d66362---ritev.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/sozakibinivubosul.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec473f7e0---ditimevudijinejomunif.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/753684120.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/8934299779.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14473625471.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/83117530321.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/88252641042.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614102742086e---10328459795.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/15326249989.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/venipalija.pdfIn PDF document text
    • https://iword.de/userfiles/file/11508111412.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e346e44df6c5eb1bdd129029999b8a3f/tijojizutilorixu.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/1266458949.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/bobute.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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 17604 bytes
SHA-256: 19c4a5ee3e904b3b29890af0191bef68fcf82ea0460e4846fd79b2ff9667db7a
font_02_sfnt_off00012493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12493 10812 bytes
SHA-256: 2ad783eba897f793ec5b37d638d181395f8cc10505f473de484dd0847fd71104