Malicious PDF — malware analysis report

Static analysis result for SHA-256 72693469387e921b…

MALICIOUS

PDF

84.6 KB Created: 2021-07-02 03:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d3a5128092560e2ba5843f4fdd27069 SHA-1: eef6940cba193e269bffab5cfbfdec2dc0ee4fb8 SHA-256: 72693469387e921be19fd0b1ffc3bd1fcd24d2898a576e55972c4a67e47622ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links. No scripts were extracted, but the overall structure points to an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://iuoshili.com/upload/users/files/jabusedinavoloxaku.pdf In PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/a7m99r2b5sseonfmdejrlbm9tn/pozuxenijujekexi.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9ca63e2c7---40374441382.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210620001318155.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5f1ccb005---44602063985.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca6e928eb---muzebatebapux.pdfIn PDF document text
    • http://cosyromania.com/media/file/dozadopopigese.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/kinelara.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081493c06aae---mebawebeto.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hnfqrp2rgjpf8eeqotiq8dcimq/46538328562.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/guwudide.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/f2c81c9a961h6edi7h7i7knkbq/musasabajiranerigaf.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2a63dea23---werafomipujopagabedezali.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af2e6840469---wegomixozabawanejuta.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/8osm1go3ibfqsl2916f72fbqtl/99079305514.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609629b4e55ef---94252976432.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607748591ff60---66580692904.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/56013711456.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/nodidifitadibajiwifuje.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/od1n8j99rkfo3jpi70jh12uajq/nozapuwifagat.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160717edfc7060---6093366886.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3bc755a5e---dexubajud.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9eb97f67712895d664a45064a7dc854c/92903385118.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6e29e419ead5a137c48e89692e395aae/37089764420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=food+safety+and+traceabilityPDF link annotation
    • 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_off0000e8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 10700 bytes
SHA-256: d972078965614d07e8fa79c9e9ddc29f83513d3636d2af2fecd595e9b96ac463
font_02_sfnt_off00011982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11982 16836 bytes
SHA-256: 5fd4a4881a10a928f0027f867b220e1853f853515d50bacd8e9fb61d7c1427d7

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