Malicious PDF — malware analysis report

Static analysis result for SHA-256 461a098348516af8…

MALICIOUS

PDF

95.5 KB Created: 2021-08-15 12:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 146544bd5b28f5ecd04a07fcdfbe5786 SHA-1: 06d63cfbf0bc69981123186b9b5ce8890f5fb885 SHA-256: 461a098348516af83e6cf47c9e96f4c205fb6e671189cc55bfef901a432733b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/988ec10e070136b86c1155b3b06df668/79914003900.pdf In PDF document text
    • http://brandiassociati.it/userfiles/file/17953246177.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/40891996178.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/jokinetit.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/3be084fe09abed999df2aa415d037eea/zuwalimawelumefimugakesib.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/44050538338.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/31826051754.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/21138111908.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/korigul.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/37271803155.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b81e95106fd---25625374068.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/6941329071.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805c9657f6f---30199377588.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/2d268cab2b534bec62df2784ce76faee/zasinekuri.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/3355778545.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/32485367503.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa1c1ebb04---22180543801.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/392611d1040f7bd1386dccad3a2f56d2/jaxewizifusigu.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/22010707536.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/8a7c08ff8852c9fc637990f7a5eb30cf/7464698601.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5l03b5fkjgg62ggnjc198mnd2o/62459696398.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/xilovuzukigizanipinosafe.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/61187414001.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0245e376ba---mekoradurexokolumekumera.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/japewiduluzit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+apply+pm+ehsaas+programPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00014a13.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14A13 21536 bytes
SHA-256: 5f105cb4b2c7b2c9c01290d4cca3a8e2941418e67a9e8ad837069f2e4cc50b5a
font_00_sfnt_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 16976 bytes
SHA-256: 43c929e76739c1f0a5e5e0e7e7b72f03b1e104e04d4322684877fefaf385ab30
font_01_sfnt_off00011957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001316e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316E 10696 bytes
SHA-256: 00f589cb88d199362fdc7404ddc4358975690491fc0bf053044dd46f9a6311a1