Malicious PDF — malware analysis report

Static analysis result for SHA-256 e832e8aa335fb96a…

MALICIOUS

PDF

82.8 KB Created: 2021-06-26 01:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e848feb3357746a3ff12b1651755004b SHA-1: 82801085be20a4dc0d0297c4e83076152163a804 SHA-256: e832e8aa335fb96a9aec19c56abe093cb4d1c3c3aee1a3035b9b93f3cfb78a00
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous other PDF files, many hosted on compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to download further content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://botosani.ro/img/uploads/file/fusorewilikolipojo.pdf
    • https://nestsearch.in/admin/uploads/file/gapeduroxagomeneb.pdf
    • https://dm288.rs/slicice/file/poxutinozawapotolom.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec53fa94d7---malazunobajodomup.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd9be0d24236e42451ea3479e3875802/65002912143.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1acc241c79f50fcaa9c56a37e5ad12c4/sonanosaxuwog.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d031645e71---19574242785.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c4f93cdd1e89880bc5801868b9f8ec93/nugefotigekakigorekipe.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607015f671a21---90850165620.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/wamugus.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b42a1715fe---83392925863.pdf
    • http://macabrey-luthier.fr/data/Files/91168382522.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf17c385e6---lotipet.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/69146108b61d49d804b11c72a6e6934c/87825606562.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/72dfa4ffc4b3cfe5f6bf7567a0aedfc8/97388146394.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/sovebobosojokageji.pdf
    • https://supermagnum-bg.com/ckfinder/userfiles/files/26945584188.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c62259bf3ab69e13f1f1db2e9e9fef9f/90841522804.pdf
    • http://chayka-svg.ru/files/37591642035.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ocs5ebr152fjbokpet2ne7g4r9/murifidizinevijupe.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160aba6e51adf2---2993959538.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/4cg481hggppgqjrogacdca0p9j/54077967323.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bailor+and+bailee+example
    • 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_off0000e4ef.bin
1b023b863a2de4eb26b0a2fa6d90a96725da104fdc1d755836c7214ba6ba8917
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 10580 bytes
font_01_sfnt_off0000fcbf.bin
8fe4f85e9e07aff07d58f12f69226f85f32575961cda41f9a6ce0a8ea8123aec
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 16016 bytes
font_02_sfnt_off00012610.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12610 16792 bytes