Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d55401b0ec82bce…

MALICIOUS

PDF

97.5 KB Created: 2021-09-16 09:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d81d6442c4815c9ffdeefd916f15373 SHA-1: 8127242f7cb811c6cad9cc9d55a13cfafdfbda7e SHA-256: 2d55401b0ec82bce31fc97b4a0347515e07a48003225a57e5d84d09358c7b6a0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to external resources via a link farm, likely to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd169f470---babesesap.pdf
    • http://inbiosa.eu/static/cfiles/files/31336846601.pdf
    • https://mami-m.com/Uploads/userfiles/files/38338681061.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/dopatuzijanujuzebit.pdf
    • http://darstin.com/userfiles/files/75676101987.pdf
    • https://sangolongphuong.vn/longphuong/news/files/kixodusikironebibon.pdf
    • http://cdkuysuujk.handysociality.com/upload/files/wuxadobudaveze.pdf
    • http://elitaliaweb.it/upload/file/pariwubuzugavuse.pdf
    • http://newworldss.com/uploads/file/pabipiwig.pdf
    • http://datev.hu/ckfinder/userfiles/files/miximi.pdf
    • https://aecvfcom.nrgence.com/upload/userfiles/files/83165562638.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393eda3d6d4---57112538682.pdf
    • http://saltokisport.com/uploads/files/fixivipalufajut.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/noxuwefamenavozumotukot.pdf
    • http://skupka54.ru/upload/m/pejeko.pdf
    • http://weingut-suppan.at/files/nixuxoxoteripekagadefex.pdf
    • http://arsvet.ru/img/upload/44499695988.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/61d000cbd79e778f6148fa10bd8d2a60/74542674317.pdf
    • http://futuralagoparking.eu/userfiles/files/riwinokitilokijewajiku.pdf
    • https://www.adom.biz.pl/ckfinder/userfiles/files/67576666021.pdf
    • https://typeone.com.my/ckfinder/userfiles/files/zisudi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=house+season+1+episode+1
    • 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_off00011800.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11800 16792 bytes
font_01_sfnt_off00013012.bin
a17004602e8943fb2cefba088b2fd64086d4f658fc849299c37fae8105e6a796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13012 18712 bytes
font_02_sfnt_off00016137.bin
bc27ad32ce4851751ab5a1cd7c48d7f353593bbcee62027ace7b3a1e7bd3a43d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16137 10284 bytes

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