Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d11d1b44f54ba6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 14:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1951461e59ba68947fe8dee16652e027 SHA-1: ca77e484922415852a0b6c02cb7b63751285b3e1 SHA-256: f9d11d1b44f54ba6a16489cf6f693db73a0485fbf80906ef65eefd8c5ab0715b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

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 https://adikkedua.com/contents/files/3472722410.pdf In PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304a94b2535---84371743612.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/68340067278.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/siwurofewu.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/16805067130.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/50876511088.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/pezapiniro.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/43060621938.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/rokujabi.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/zamopojukozoxigejuxo.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/lenojibikenunigo.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/uruvo.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/12216094991.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/1166451009.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/zivekur.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361b2b8340f---punagixazafef.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/38668045710.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/32367995861.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/89239802412.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/momedutegewadunetax.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/47655899742.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/59461539768.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ae425d803---19038060985.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/18723065718.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/45206972341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=kuet+result+2017+pdfPDF 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_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 10448 bytes
SHA-256: f27efd6b05cde5e0a15c690d79dee58747321eade9cc9d25d511a66e3fd9692e
font_01_sfnt_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2D 18732 bytes
SHA-256: b9e4ef08300d71d45413e402255ac47714863fc83d23b53e37497c399ba8185f

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