Malicious PDF — malware analysis report

Static analysis result for SHA-256 63556c857cbdb16c…

MALICIOUS

PDF

74.9 KB Created: 2021-09-19 17:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f50c42416972dd9a4d4e4e49122286c5 SHA-1: 528cbdb9bd2aba60815ccfaaa3bcf4663a712116 SHA-256: 63556c857cbdb16cf83d1dd9d7b00180c2ed97b825a43d8a5531ee1954fff706
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://newdesert.pl/userfiles/file/xanuneletukikub.pdf
    • http://ateliergermain.net/sites/default/files/file/tatizug.pdf
    • http://laxycoffee.com/upload/files/lirojew.pdf
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/paxiko.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613767bd8932e---remele.pdf
    • http://madiagranitosilano.it/userfiles/files/61873471236.pdf
    • http://intimatehotelpattaya.com/image/upload/File/78524644961.pdf
    • http://xn--h1aeekk.xn--p1ai/files/file/84680530856.pdf
    • https://nvsrolko.org/ckfinder/userfiles/files/kipisul.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b7af8c1f78b1a609279586817e7a1b46/75595462044.pdf
    • http://karpatskiles.ru/store/file/rokadinugajakepox.pdf
    • http://paroissedementon.fr/upload/files/7885750689.pdf
    • http://bandbaajabarat.com/ci/userfiles/files/pejugotitanajuzoz.pdf
    • http://poptheme.cn/uploadfile/files/20210914_063636.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/66f2a77f98216fd004563b2c92713977/lomisolamozoteketuxa.pdf
    • https://rowsontw.com/shopadmin/upload/files/fibutogubosunabizapesa.pdf
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/zetuzaxi.pdf
    • http://clubselectionvoyages.com/images/file/duzaf.pdf
    • http://sieuthivatlieuhoanthien.com/upload/files/buxelodidiselufivofop.pdf
    • http://gabinetortodontyczny.eu/userfiles/file/xoviramajo.pdf
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/44753339019.pdf
    • https://zenit-npk.ru/files/file/zabifapabokavomusuwo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=phone+safe+mode+off
    • http://irodori.kir.jp/files/file/gesovodolipejivofanuj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e1.bin
95a693643cd95b36448a58cd380cc5687445430a4edaeb14a6fd3e556d429c0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E1 17108 bytes
font_01_sfnt_off0000ef8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 16792 bytes
font_02_sfnt_off000107a1.bin
56b418c2094b0ac824d16f8f99744c9f101ebf00681674a70c57d705b7a9d61a
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 10284 bytes