Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bb9d0fb5d554a3…

MALICIOUS

PDF

72.3 KB Created: 2021-09-18 06:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2fffe2bc8da993f741f0661b26bb8f2a SHA-1: dd3a7d339fe574be28c836c2b52b613e687e2587 SHA-256: 73bb9d0fb5d554a3e77da4577a36d9cf109fec35b5f9d23367e28c4b06561ad3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using a large number of links on potentially untrustworthy domains, likely to distribute malicious content or conduct phishing attacks. No scripts were extracted, but the extensive use of external links suggests the primary attack vector is redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=the+pirate+bay+proxy+list+org PDF link annotation
    • http://wsp.pl/userfiles/file/siwuduxozakare.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613655c69e52a---34041387263.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/gonujazuvurukiridafadoduk.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/41097803460.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/fobabugunilimopevabe.pdfIn PDF document text
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/1751250517.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/9712727246.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/41012629988.pdfIn PDF document text
    • https://hklh.vip/data/attachment/file/zigafurut.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/58902529645.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/36040128006.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/69946238370.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5adce58ea0acc3a9a49c3c22866c42a4/vudiguli.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/21376077948.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/fexobanovaziwitum.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/80725747268.pdfIn PDF document text
    • http://www.ezmoving.com/file/57756559569.pdfIn PDF document text
    • https://latework.cz/soubory/92566762490.pdfIn PDF document text
    • http://webs123.com/userfiles/file/zefilumubelexeverozu.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/38689365905.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3b1rd4p91c774t0tgbg3e21bhg/91711333475.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/kakogojijakolapepul.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614001f58ca96---31655924289.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613859df06067---pawoxoxifoda.pdfIn PDF document text
    • https://12shio1.com/contents/files/xepalolaxifojowafikogiz.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_off0000bacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACD 16088 bytes
SHA-256: f2be49329b8b050ab8a308f30e277be2da80e978ea3b619b3f5fea206db5bd04
font_01_sfnt_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 10744 bytes
SHA-256: b02696f1bc9fdc1fb27aff3e47d98aa77f8704f5b3fbec680c9e89f4c3d010bd
font_02_sfnt_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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