Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92791c7d702576e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 00:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e382a3b7ef390ad2c5ed93d0a7693377 SHA-1: 13f16d9f4dcc6b23ad803a80d271a45c8505ad39 SHA-256: c92791c7d702576eedec1a1db19fa1ae9657acfdbb6b06992bab181c72d8f447
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143eafdcbbae---13779736269.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137379711f2b---katokegow.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/38594057938.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/60471316066.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/nowaxibubud.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130612097264---zabavufafedusulebex.pdfIn PDF document text
    • http://xenangheli.vn/public/files/51852901198.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/valulixexiloledataxe.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xijivakasa.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/vamimapusuwab.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/74560656339.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/nekurutozizeweg.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/50940504380.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/50378852642.pdfIn PDF document text
    • http://goldia.cz/data/file/gumujopotulekikabafoxu.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/52735210672.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/19630882733.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/82306545914.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/rizinugurito.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/92700986655.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/luregijaluj.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bh5ah42jpt97ojc7dfepfouc72/40045712153.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/vawafenijoxudikegotidun.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/vapadujozajavisadametat.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/jupoditubeladebebipeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=m4r+to+mp3+converter+android+appPDF link annotation
    • 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_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 17128 bytes
SHA-256: 68de4d32737018f97c10de7f1418f3d36e5161fd2357533ddc40827da63482cc
font_02_sfnt_off00012add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADD 10768 bytes
SHA-256: 9d848584206274b911baf96a81045aa4fcddb6885bcc5ee8645ca43810a4c531

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