Malicious PDF — malware analysis report

Static analysis result for SHA-256 8734107204557c5a…

MALICIOUS

PDF

70.5 KB Created: 2021-09-23 09:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 227881f64c35b906fdf25ac8517cf101 SHA-1: 21c73d5619a49d09d40d392951f3361cf40f2357 SHA-256: 8734107204557c5ab69a135a174e584f3fc9ac6262a51d5962bdafd4e1390bbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the overall structure indicate an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=data+obb+gta+5 PDF link annotation
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/09bvg0bd3nad3afphbqepetspc/semadobogane.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/maritixizo.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/wakesog.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368b2f02597---68872798358.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135caac40d1c---37689596201.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/43025062733.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/lelatenanogeg.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/48872773191.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/37633182389.pdfIn PDF document text
    • http://esistore.be/userfiles/file/wokokosikunapimuz.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abcc9d8c4d---48571309268.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/koponisekemijagododab.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/nugufupoxinuvuxejivubireb.pdfIn PDF document text
    • http://malifer.hu/upload/file/38960689948.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e943b9c73---sukadepigumosegukaxu.pdfIn PDF document text
    • https://ms02bet.net/contents/files/nusaxizixekuvubifevop.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/36679101199.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109181805499171.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/94982944589.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614266aeb6970---somituwejumefapap.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109060921132930.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_off0000b517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB517 16456 bytes
SHA-256: 4369599cbbb62980072f16713f4fa098a3463a2747c92e808dfcc1460c34905e
font_01_sfnt_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 9916 bytes
SHA-256: 0ba0e9b974d48bcc421ab19f0d90552553b6027ef9a3ef4c422bfe05d6a12389
font_02_sfnt_off0000f539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1