Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e420f91d04e6080…

MALICIOUS

PDF

87.6 KB Created: 2021-08-10 08:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68afbb30dd1b3824506d5ce3a0d6ad7f SHA-1: dda3a24252759c9d444ec1eabd4dfaf13ac68fbe SHA-256: 0e420f91d04e608075f781f65dc5a391903ce2356b151d16f34032c4e1cafc80
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ce3d02192c80a87578c4a85bb670b408/74509050387.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f58521184b117d6ba55b997e63b9b13f/dijixojarati.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/aed78b13a2ae3a08a92fd5cc17e2a60f/tupawamid.pdf
    • http://arlingtonhigh1960.com/clients/881088/File/86851379030.pdf
    • http://thsport.dk/ckfinder/userfiles/files/devusuzanofiketexesite.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/93216744302.pdf
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/52137513900.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608289aaee983---vigebesox.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/javirinoluke.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/u7ha31pmd7lag2bosfn2nne8pa/10959672904.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5b67c0347330661b1e06cbff1eb06bf5/51290596280.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e91087c2b---fuxagonubejimuvuf.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9a95882c4---suxugawusix.pdf
    • http://szpitalstrzelin.pl/userfiles/files/lazadu.pdf
    • http://allaboutdowney.com/userimages/gexadudikikajisuf.pdf
    • http://okeefesreef.com/ckfinder/userfiles/files/redodoronowurabarovuraka.pdf
    • http://noospc.ru/SITE/files/editor/file/76063220085.pdf
    • http://canoeing.by/pics/files/pafawavujajas.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a1564a6d---61415661302.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610630cb2b8e0---paxad.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/004470fcc2c6ce76f77f41a3ab699aeb/juduvufegigapapa.pdf
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/89267087909.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+remove+google+play+services+keeps+stopping
    • 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_off0000ef7a.bin
a575da13530013d3847fef79cc3c131c860befb40c700d61dd9cbae40ad0e3b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 17088 bytes
font_01_sfnt_off00011bfc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFC 16792 bytes
font_02_sfnt_off00013413.bin
ed9ced9978bba68e1f55ea0d8b344a28874bb77b66b5fc49078f57c2823319dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13413 11068 bytes