Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e843529829c532…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 04:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 95729e6c595f0d9461dbb369958bca1d SHA-1: da9693c41a93c1b13f5f80edcae7511b4a6b8733 SHA-256: b8e843529829c5320d722627cdd938e6065f6648871e2f821f2659985b56ac08
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous external URLs pointing to potentially compromised or disposable hosting. The presence of 'utm_term' parameters in some URLs suggests a phishing or spam campaign aimed at driving traffic to specific content, possibly for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=super+street+fighter+2+turbo+apk PDF link annotation
    • https://booknowrentalimo.ch/userfiles/files/lelakuxarawesepasari.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/58637749890.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/peberabize.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/zujakexef.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff896015a4---fadaxedoboj.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/jifefaz.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/ratitajafos.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/40544345888.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/julokutewo.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/zadafegokuvap.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145d4aa6f421---jodub.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/98383226339.pdfIn PDF document text
    • http://recviem.ru/img/upload/sexiwaxobobawiwolukewi.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/mijuginawijexozejo.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/palapademusogezotawakej.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/57011766427.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b747e5ab---91802852117.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161316c98db9bc---80830629662.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/42316984523.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a086e55cf8---26556500114.pdfIn PDF document text
    • http://arsvet.ru/img/upload/gobevivomejavefodev.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/17344658108.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/pukagawogote.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_off0000b776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB776 16956 bytes
SHA-256: bf9bd94ee4e17536a084a98a8ada1ab73981eb8ea3b2ee9bd86081ce77f9a5e0
font_01_sfnt_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB57 11016 bytes
SHA-256: caf833124bc463f717bb689b712d64d5686d2fe2a76ef3b1074c6fd2f64fc2f8

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