Malicious PDF — malware analysis report

Static analysis result for SHA-256 149c1a68df0a16a4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 07:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: becf0503ad065f3fc195e14b19667c88 SHA-1: 2691c194b4451f82d7f70a7d9845a619a2b4863e SHA-256: 149c1a68df0a16a4688f8f4e19409e6ea7e70971abae8d0bbdb6e837a27e477d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by 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 0.9902

Heuristics 6

  • 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://queure.ru/uplcv?utm_term=how+do+you+make+a+potion+of+harming+in+minecraft PDF link annotation
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d158d6820a---22731881321.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/nbfkpspembfqfrbbf0p05ctt5h/kepavexox.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/61804000128.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/51810979280.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aab897fc2d---wewobaxelatenog.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/jifabobik.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/545460b7e18346735eab40407bcc73be/ruwigekinukiliwebem.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vanebukupemojado.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/1891342331.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/77512819278.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/45241874543.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739cac9a453---14077822757.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/zexomi.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/44604208052.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56331c9cd4---xalavusexolekopin.pdfIn PDF document text
    • http://immopolignano.lu/images/piloweremalemutov.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5a184a9f8---66248691024.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/lesidakawifukamopawakik.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/21850311985.pdfIn PDF document text
    • https://andana.us/files/files/65714959652.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/rujivurujutatili.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/jetifidejipunumi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c15098c8d8---71443630366.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609afb64914bd---vajowobaxujekibadimotumor.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/3927619782.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/zedaxudonazotoxojoredes.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/37342270249.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_off0000d1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A7 11236 bytes
SHA-256: af4c97715f5a05a8b144744651a8a510807178eb8b97fb0c771c7fb4b24da430
font_01_sfnt_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 17140 bytes
SHA-256: b70259757ef26bab6141c6b5f0f5782e71129e1a2ede5a08cbf786f678b2c914

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