Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ff89fda1ea6b86…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 00:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15734e61877b377e6cf381f80d29e0a3 SHA-1: 4f87504f0aab12b6afc9d239fee5cec9e0004207 SHA-256: 03ff89fda1ea6b8653ac7b9027ecaaaedecb5a99ca185310b0a8778b52b56c60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=keynote+426+pdf PDF link annotation
    • http://altiro.nl/home/tjerk/file/nenujeniliwufatokuxepuxo.pdfIn PDF document text
    • http://samromschool.com/UserFiles/file/76355892877.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9887a536a2---sojiz.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/66593013854.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/vabakizifixopedobuwigaru.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/fabiziwoxosamimur.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98a14006c---8770343665.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/656eq8tplja85tacjtufj5gook/25893642670.pdfIn PDF document text
    • http://bamila.vn/luutru/files/rexurojufower.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/3579bb461e28fc89aa5d87c3be70e967/vatumepojabopobopubonu.pdfIn PDF document text
    • https://quaint-house.com/famef.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ojhhlu8516hql6tmn99m5in621/bujetimewak.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/85259309622.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926c0ce2a06---24795119478.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070521ad1af2---78534350066.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/70464836919.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/mofuxoratomaxawigunavalar.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/92877488058.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210826_170720.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/86412479421.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/ruguzubaxur.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607309276c049---29388932293.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8d479a2471---26452001951.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/punemunidadis.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/54172678680.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_off0000ba0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21D 16376 bytes
SHA-256: 423f59f61686e122f3f4f5eea059c9b4f8c6263419945dffa8b01c37b8551773
font_02_sfnt_off0000fc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 10396 bytes
SHA-256: b74a844738a1c6f25c9d01a1b70430fc6c3c3ddca3dc69842530156e07f4f121

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