Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1ca25162dfd11a…

MALICIOUS

PDF

77.0 KB Created: 2021-06-10 21:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3ea8ce6aa70f25a5e7b4a9f232978d1a SHA-1: b66359ee472247f2ae7aa2b0de86949b50932720 SHA-256: 7d1ca25162dfd11a816da6db4a6e2f88351905da2c1a1a3d0309051a06d09387
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous links pointing to compromised WordPress sites and other disposable hosting domains. The document body, though heavily obfuscated, suggests a lure related to cryptocurrency. The ML classifier strongly indicates maliciousness, and the link farm pattern is commonly used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://laborke.ru/uplcv?utm_term=how+to+create+a+crypto+coin PDF link annotation
    • http://archinfo.ru/uploads/file/wepinakamuxurazekimomuvod.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa2a770f5---90037094564.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/e8abf33c729ae4b6eb93f36ce5276e0a/diner.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/9709112608.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b520353089f---38938368468.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae00d7abecc---26445931685.pdfIn PDF document text
    • https://activepymes.com/pub/file/tuxuxebuduru.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sh6rm6uc9glkkoji1bhtbmtoo4/jurezesotudafusazuxokoxa.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/fbcg2pmr171tn3lr6edhorg50p/ketevabuwekavoso.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/86664161813.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/rorowinefevisugude.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b79567d7---wukokakixowukawepor.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/pb9egf13ulue67f8to9nip37rk/zarivawasewopokesazem.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608473b51004c---likebovanetulododinuwuva.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/13387c8253fc4e3d73b162f440b12a05/tirikebudaninulimetumiret.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f664a24f82---nidizudugeditinutu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608600eb24987---basasevunibefona.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 4872 bytes
SHA-256: ac80315ab6ae981b370b3fd28471a4c307376a6ee6a1b95e24b014bff5f9b8ae
font_01_sfnt_off00010171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 11012 bytes
SHA-256: 1e3e3289f17c6d82e073820bd702857eef13e2c5e16814f6a8e822b7f4dfc3f1