Malicious PDF — malware analysis report

Static analysis result for SHA-256 830f46a42fddb801…

MALICIOUS

PDF

77.5 KB Created: 2021-08-30 14:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db005c0d7a10eb8669397ac8212f2660 SHA-1: 8e0f054cff4d351c101ba570455027a2d2b66c95 SHA-256: 830f46a42fddb801a30657c4e423df30f73d10698935651a2b7e8a1c682cdcf6
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the lure of a download, likely leading to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://inwebjor.ru/uplcv?utm_term=www+free+pdf+to+word+converter+com PDF link annotation
    • http://syntra.pl/userfiles/file/22499012483.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/47484034225.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/34181302865.pdfIn PDF document text
    • https://renetravel.ro/images/files/51037507149.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/dotogiseva.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/wikokorapivinegokib.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/tolewulelixevuvuliru.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612381683e436---45583935875.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/17871625771.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac8f00f7bc---xavijefe.pdfIn PDF document text
    • http://klinok-saintp.ru/files/72196039044.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/zolelivudisi.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b08b34f3024e3fda93abd9fba23d6206/21393926607.pdfIn PDF document text
    • https://agermag.ro/mm/file/gekukuginaxijabogusot.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/bofutejumozuwapewupi.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/j7mll9omoi3eirnkr7vgmkam0h/sugubirekukipisid.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0179acc9226652a3868ab5f55e506b73/93731824489.pdfIn PDF document text
    • https://petek.biz/resimler/files/xapudalisekewigizufinon.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089cba3926f4---23498231743.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/1ec2e6c307c4b1fc228a9ab2f4841d51/worodogaruridewesutuno.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_off0000cc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0D 10456 bytes
SHA-256: e0dd49c8a23024760eca8ca9b2aea08bfa32ad744da7ba48db68d47e832c7078
font_01_sfnt_off0000e3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C8 16828 bytes
SHA-256: ff66f2f14be11abd48441a6838a2132eda173d1103152a46a29c43e78bbbcdf4
font_02_sfnt_off00010f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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