Malicious PDF — malware analysis report

Static analysis result for SHA-256 7319ac5e067cdd00…

MALICIOUS

PDF

107.9 KB Created: 2021-09-13 06:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0328ec88bad07c9142e471feb2f7d764 SHA-1: fc7f5309e796e39d45ee714e1417a394c7c7cd9e SHA-256: 7319ac5e067cdd003d42b8fcd7541ac7a5deda98a4ee08f0bed5c1b07b6e2089
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised CMS sites, designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structures and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cam-ceeds.org/ckfinder/userfiles/files/golumeg.pdf
    • https://floridagreatescape.com/media/file/xadabimojatovegexej.pdf
    • http://fantacyhandicraft.com/userfiles/file/75850892249.pdf
    • http://futureinfashion.com/ckfinder/userfiles/files/kemapagokonigapavibof.pdf
    • https://www.almuhja.com/ckfinder/userfiles/files/temikozobogusito.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a09a9c46---xalevaluwolina.pdf
    • https://grootformaatspandoeken.nl/userfiles/file/2961298680.pdf
    • http://tnhmc.com/userfiles/file/wamubotebe.pdf
    • http://good163.cn/Uploadfiles/files/wibegejujubo.pdf
    • https://satesayap.com/contents/files/wadotadalezu.pdf
    • http://etalentlink.com/uploadfile/file///2021091200465512.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1504197309e8c8601760d6c9343ea6f9/59843841754.pdf
    • http://inruho.ru/ckfinder/userfiles/files/38336580694.pdf
    • https://aglogistics-bo.net/userfiles/file/76669685240.pdf
    • http://progettarecasa.com/userfiles/files/93821066450.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14701ae67---xirokazagixelatopusezobas.pdf
    • http://teplo76.ru/uploads/file/vaxixomagitazujipe.pdf
    • https://kiptep.ru/file/garivikukokepikikewilowo.pdf
    • http://files.ibiza-ferien.de/file/gumidosukovekolejagepe.pdf
    • https://accidentmatters.com/ckfinder/userfiles/files/wekajasepulasafoxidimu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=when+you+truly+love+someone+quotes
    • 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_off00013ff4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF4 16792 bytes
font_01_sfnt_off00015806.bin
a9ac69b72f03c86cec6859ed2fbadfab0705ddd674416d4d082efa1c1a1d5e22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15806 19364 bytes
font_02_sfnt_off00018a3b.bin
836c9db3feba4c0e727aa41a442e9b197451128bdd3e96d24ecbe35fa084eb33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18A3B 10540 bytes

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