Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa0b831fa4bcb4d…

MALICIOUS

PDF

71.7 KB Created: 2021-10-02 18:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7932952d1072f46cf76ed6b64a547719 SHA-1: 776356017c6f82becb50b80d9f6fee71deed731c SHA-256: 8fa0b831fa4bcb4d8fa92be7ec5a5963c660a15059fed0c640051ee4d45f2517
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to obscure the ultimate destination, which is likely malicious given the ClamAV detection and ML classifier flagging. The PDF itself does not contain readable content, suggesting its primary purpose is to act as a lure or a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://allytemp.ru/uplcv?utm_term=temporary+boater+education+certificate PDF link annotation
    • http://www.eatvirukai.lt/uploads/files/terigevatipanigekegikez.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/ruduviboxaweburibomawopep.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/4419418292.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/zakenolax.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/52826873658.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/52208650315.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/66366337526.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/rexezazanokuseg.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614cde82d4754---27512671015.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/12674525525.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/52767138208.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/62329968340.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/43050521050.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/tizufutowelerefuwaje.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/zevelexow.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/warerarofovokek.pdfIn PDF document text
    • http://esen.life/userfiles/file/rotitagutelinubega.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/vopejimorabixevopivo.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/batabopekuri.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613515837ed64---lexipewidokixapugine.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/tejexolapipumixigini.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/bokuwirujedol.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/vivuwuwusudafida.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/51452845221.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/jutefizojan.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/46703774882.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/90180825234.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613875a53ae31---59052856067.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_off0000b885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB885 15260 bytes
SHA-256: f2e5d1f499f56a67626cbd7f6ef1e466332a9d37a1a28aeeee035066e6591f3b
font_01_sfnt_off0000df85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 10884 bytes
SHA-256: 24637b2f48254b47261fa197535e542ac472c695bbfb5bc01918bbee2104abcb
font_02_sfnt_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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