Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3aaea9ce7ae5b2f…

MALICIOUS

PDF

92.2 KB Created: 2021-06-26 13:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7770a06c07156500b1c0a74c2d77e6e4 SHA-1: b33f762d18b59da9fadb1234fd9d6844cbdaaa76 SHA-256: c3aaea9ce7ae5b2fcf2d885ae6138c01a834e38784d412f04ae4bf74e965cff7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the nature of the link farm suggests it is part of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://philabc.ru/uplcv?utm_term=wow+tbc+warrior+leveling+spec
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/g0m237e90e7996tajssnoeihp4/79049888846.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/78134bf8f590e382501c9aa40a959776/13374846569.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c3f4dd3b428daf6b8b6f0eebeadd923c/20293118925.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9e4dd135---26657238063.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/d9292cef629eba6a6449d32f385c3e19/19607148553.pdf
    • http://year-c.com/upload_fck/file/2021-6-16/20210616192322967886.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075859ddb33c---pixab.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/nobarajed.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a75b2da0469---93788586604.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e39c459ae---23454097656.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1256cddac---50641235458.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16076e8113cc3f---97509990999.pdf
    • http://portalpr-b2b.es/img/user///file/_0635661001624560563.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/1328be01c5de0d525e11e059ddf2d511/32184445900.pdf
    • https://n-zvuk.ru/upload/file/38826115817.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9b7b4cc163e9e1b766a667bda92f14f5/mejavejap.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7853a0f4fe9d47d4f33ad0a124356411/68589016906.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/00e434ddf1c71ad7a2ce1afb013a0a4f/tufiji.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16083f19027d74---44336024991.pdf
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/37154359920.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3301433c0---81537437707.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b68010f213ac6712a623a1168905bc1e/dafexuzimorebavevesiwajaw.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32da29def---tanupukinole.pdf
    • 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_off0001027f.bin
40230416a8b12e4ffa3f7b4cd38ce6a8217d3958fe94286177ded17d58ac8df9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1027F 17776 bytes
font_01_sfnt_off0001313a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1313A 16792 bytes
font_02_sfnt_off00014951.bin
be4b0668d5b14fe9895f612cfe7bb3df207b8b0fe66d4b5f437fec8ed4f7f2d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14951 10836 bytes

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