Malicious PDF — malware analysis report

Static analysis result for SHA-256 900ff6e7928dec36…

MALICIOUS

PDF

76.9 KB Created: 2021-09-02 12:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd57833a3568b241f4255557b49f8f5c SHA-1: 1e690f96362db645b830365504148d7f5c2a6a57 SHA-256: 900ff6e7928dec368a3cf32898d08483aaeed6b4e5e67b5320ce3b1ad8444c4c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is designed as a link farm to distribute traffic to potentially malicious sites. No scripts were extracted, but the structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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 http://aaz.sk/editor_uploads/files/xadidonudutidawegujiv.pdf In PDF document text
    • https://andana.us/files/files/41207311602.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/83540096887.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/zukesabuwetoderezofen.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/76a3c9f83c98eef78f423d09a039c04e/pumitoxu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607051bf54f64---zamoluvuduf.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/1af97901f3d09d176b6235c07f9ceab6/wuforilikozowejedinej.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b3067db5---sowinuwaw.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-8-17/20210817174715991096.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/simivoruriwutodok.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/97690251075.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wewotanuju.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/81593564146.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/16710947435.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/655931ed73ae0c19ab0abea113e9a952/16258191013.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/50616368761.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ca10631fe---61734454298.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/nedifagonem.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d9954ada---5343920359.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210701_05F1AD6640A53C7A.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/bokudijitozevexitoga.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/21548020906.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/20363284873.pdfIn PDF document text
    • https://everestart.com/images/stories/file/98174306780.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/koq85v1fblq57i23bct626a600/vojedopiladudatusavulo.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bd26a69f7---wovufijasunajojoked.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=worksheet+for+ukg+tamilPDF 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_off0000c7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 17420 bytes
SHA-256: e9e8eacfe60f3b9c07748f04bef8525a8bef9b11c5213a68265863da093d0e8a
font_02_sfnt_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 10740 bytes
SHA-256: 61d736882b2b08c26bf9c254a0438b5ef7143dcf5001e129a61b9838956a4ddf

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