Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c864a1677ae20b2…

MALICIOUS

PDF

72.0 KB Created: 2021-09-16 02:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e627fbe4cf709f65b78e6ce2475c7e77 SHA-1: 740a9366cda0127f6bfdd89c5695fbfa4f5d277e SHA-256: 7c864a1677ae20b23b32731fd12f009bec6ae234caa7e3b32f18745a77a955bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that form a link farm, a common tactic for distributing phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a download button lure further supports the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=kinemaster+download+for+pc+windows+7
    • https://saksisan.com/upload/ckfinder/files/97601244901.pdf
    • https://bnbtravels.com/ckfinder/userfiles/files/19171245841.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133eefb2c517---ribad.pdf
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/ninotujojawuxevutilusiti.pdf
    • http://naoshima-habitant.com/images/blog/file/wupatuminolavuxolim.pdf
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210908082229.pdf
    • https://medpressa.ru/files/file/17182874964.pdf
    • http://archissimo.eu/userfiles/files/gafatos.pdf
    • http://didopack.com/files/piwes.pdf
    • https://jamuiboe.com/webroot/upload_media/silepobomukamimixitajot.pdf
    • http://boxethai38.com/upload/file/pijulemikodinujaxiremo.pdf
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/nusekiwijo.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/7c0b9ff7ca1f5ade0d7935c0ebdd8b5c/19990181967.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc45a43a1---12576664008.pdf
    • http://dagmar-e.de/userfiles/file/losawupi.pdf
    • http://herium.net/FileData/ckfinder/files/20210910_DE6EF1A0E2F106A4.pdf
    • https://sentinels.ro/userfiles/file/32841517699.pdf
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/kusupuvurewabusutixeb.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210909100936.pdf
    • https://silverbirdmarketing.com/pages/images/file/webapunidozanela.pdf
    • http://aqbnb.com/uploadfile/file/dabutafiradunogagotufik.pdf
    • http://chetaomaynganhnhua.com/uploads/files/sobol.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b73b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB73B 16792 bytes
font_01_sfnt_off0000cf4d.bin
b67c3f8a83382ada08564cc893c4bb516db2af8b4f535b2e1b12d71b220fe4ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4D 16320 bytes
font_02_sfnt_off0000f91e.bin
dc1c3c093fcbc03f0d51bd1815930272c8756cf8cae608518a09e6ba6c39ceb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 10908 bytes

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