Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4b356b8e7b95d9…

MALICIOUS

PDF

88.0 KB Created: 2021-07-27 00:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 766e3398c529a17fe4360b7fb3e46946 SHA-1: af7a02046f133b0ab66dc8e47f97f2ccc1e4bc6e SHA-256: bc4b356b8e7b95d932f928cda616c3129917e48a98f41ae90eadbbb0705eff97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a7588abf9---18496039234.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ltl3bps6t58vmkda9g50i4mdk/50161283884.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084e82ae5538---tasanonemutoz.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/606969d32892355b6e1ffbb6319254c6/ralebanelunewe.pdf
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/sudezizolo.pdf
    • http://ztkammer.at/uploads/file/figagimev.pdf
    • http://allaboutdowney.com/userimages/mopafelemezamuvakiteso.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/9b179061ee07ac9d49c9282756b3fb9f/89061524860.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bba7e4c48b0---gigoxasusuvawurevazusaj.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/u3m0ab2isujgrvr472mkj3lrmp/pururigenalulaguxovoludof.pdf
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/23867087754.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/aa90f23c5fceee06d5d95d07f5893b2e/rurifemixesivulaxov.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8ec0fb846a16aca12fa3c74bb8a34adf/fabirowupato.pdf
    • http://anhuifan.com/upload_fck/file/2021-7-8/20210708082122205308.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d0b1e298d---zitavipoxojiwega.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f1747c255---8391548303.pdf
    • https://appfacile.it/file/27288450856.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160868db06b8c8---88803486124.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3155780c---51282483486.pdf
    • http://krevue.cz/UserFiles/File/deboxegakerunis.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/9e7f17928aed42422467295a1dc92192/29648436877.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/f91476186030404032e0ee6773503992/89144108802.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608feaec35a9e---xetino.pdf
    • http://fandimnarodaku.cz/upload/file/gilezematejinifulitisub.pdf
    • http://md-servicios.com/userfiles/file/tirirasilolekojojozu.pdf
    • http://zxsolar.com/d/files/dileronikon.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6af899e5d---8151446995.pdf
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/88163126198.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=problemas+de+division+para+sexto+grado
    • 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_off0000f039.bin
759e0e156b4c7e23f357057f9130ab5d9ca78778b65ff927c373784167d417c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 17916 bytes
font_01_sfnt_off00011dfa.bin
3f7bfc3631b5bd77606ff8697597385cccc4d2d3c57101a08f728b8bea150221		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 11044 bytes
font_02_sfnt_off00013743.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13743 16792 bytes

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