Malicious PDF — malware analysis report

Static analysis result for SHA-256 5961ff4e86e6f6a8…

MALICIOUS

PDF

72.6 KB Created: 2021-09-20 15:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cf466f62ba86b2a029b6eb9ee504f12 SHA-1: 7602b9d9a85c953393b82b383a776d438e84d186 SHA-256: 5961ff4e86e6f6a807bfada15ed68bffb9951efe934aab8f2997b1556b3d2efa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bdce01408---taniwipozifovesizugivim.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/gijaxobifas.pdf
    • https://gonguyenkhoi.vn/upload/files/26419141250.pdf
    • http://domusanna.it/userfiles/files/gamusogisobikibowotop.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613154bf8d4b2---ravodewuvegovajijor.pdf
    • http://gazosilikatnn.ru/uploads/files/79708197582.pdf
    • http://mayinmaunhat.com/upload/files/23702716161.pdf
    • https://derya.afmiletisimajansi.info/resimler/files/xomazikufa.pdf
    • http://slsnn.ru/content/file/46799677785.pdf
    • http://kuppersbusch.hu/userfiles/files/gewapobevefe.pdf
    • http://alacarte-grafik.de/userfiles/file/86632376535.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161428889ef101---26958521111.pdf
    • https://ncsccalgary.com/userfiles/files/57276810908.pdf
    • http://poltinka.ru/userfiles/file/fafakotunupedazunojezi.pdf
    • http://rent2day.ca/ci2/userfiles/files/pevisaz.pdf
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/rewuputawida.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/osqtq77oo9du9e2k4fdd6quhq5/95042704931.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/0908879ef821c6c271febcf75ae5d267/46118787411.pdf
    • http://hanart21.com/files/userfiles/file/97620340522.pdf
    • https://ozmutludokum.com/userfiles/file/sawusexatelojonutumigam.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48b57f85f---bibaduw.pdf
    • http://aasghsflqsae.handylover.com/upload/files/negenobuzu.pdf
    • http://mitroc.com/userfiles/file/1617951096.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=streamer+life+simulator+apk+download+android
    • 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_off0000ba6d.bin
c142eed3f4276df55743e198b7fa2ab5e6efa9904b0ca0d1d40f8b5f84ff346a
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6D 11012 bytes
font_01_sfnt_off0000d40b.bin
127fd8b057e9a7a4d91c93d88f8fca4f4330f50054342a4e37ed24cb3e08c3ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 15820 bytes
font_02_sfnt_off0000fc7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7C 16792 bytes