Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0f28286586775b…

MALICIOUS

PDF

85.8 KB Created: 2021-09-20 15:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 03e3569d17564390ee854972f4e06c6b SHA-1: 0ea7437dda397efdbd5fa446502c2c4cb49be9d5 SHA-256: 9a0f28286586775ba748b30ab55f98773b714d9d5f97ef28344987b3d8068c4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to direct users to malicious content, potentially exploiting them via social engineering or by serving further malicious payloads.

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://pixomot.ru/uplcv?utm_term=how+to+make+notes+in+android+phone PDF link annotation
    • http://kraski-chernila.ru/resources/file/56207977066.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c9815c114---85921079576.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/xomab.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/sitixarorisudotap.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161482e9e48d65---32432921447.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/76623549649.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/22529736769.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140029822ff5---kulenur.pdfIn PDF document text
    • http://ecole.ru/text/images/file/36780949399.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/69737115810.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/fabazefujikiwabap.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/nitazezuminanidejaduvu.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/xaxufoxe.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d84994bb6---99288754967.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/nejizulo.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/94419236513.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/zagoxejabuvan.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/guvotewevunazedejuxinigor.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/gerudobigesobubaf.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/26679114921.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16309924279515.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/pafafikutesanuzorug.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/95813258271.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/90434326500.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_off0000ea9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 17620 bytes
SHA-256: db451cfe57ea8b2244ca43155967410d97a4bb3b17abc64c76ed702f3915700f
font_02_sfnt_off000130c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C4 10780 bytes
SHA-256: 97ffc51136c4f01cd70bcc18e0e4121ddafd7990d59d9b59f179107b19fb6baa

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