Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91cfa06c4b074e8…

MALICIOUS

PDF

109.6 KB Created: 2021-06-26 22:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f481a026916fb251cbe136ff8e8c4c6 SHA-1: ccf0913272c834ddf93cfccc820f0479776aad68 SHA-256: b91cfa06c4b074e8de09bc5293717f92fa9a6f9731c556fddbd18d04eee50c35
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9813

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/0608360ab97bedfd28a1dddf01ef8c9b/mekodotemuvavazex.pdf
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/57477315028.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6f867b2b62e24be678a007b6528d3c0e/teretajuvudifine.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c7f36c16---63190249460.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3bf825c289d90497b5f4a14e3b794bb7/39232777536.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/91d758227dd6eed2fcce9f8dcefbb4e1/dotevomawo.pdf
    • http://caigeshi.com/uploadfile/file/2021062609161273499.pdf
    • https://clinicscrm.com/img/files/rexuwemolimixakaz.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b39dc96e205---79178079700.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709e6eaae1f---nawakotolepogex.pdf
    • https://jxloanchien.com/style/postimage/file/90930749154.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/36e9828f59cfa62565a2648325084484/24915714555.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6607ff7d54fc6045025e640ebf5cbe4e/73529671140.pdf
    • http://jl-vacuum.com/upload/files/79700550642.pdf
    • http://thietbixanh.net/uploads/files/25525360742.pdf
    • http://jinistudy.com/_UploadFile/Images/file/77302020107.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d4cebcdde---56907602159.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/e806756fd3fea00d14e15b600ff2ad34/fekeweponaf.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e9b4bb77830aa911d0edc14ad917473f/sunolibuk.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/kanulaxuripamefobi.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/lhkargcrj6eg2iq3rfg8qdlchh/dobadenorabotuf.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/4oksq2o46h64odrbtneglgbcog/kuzeroraz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=meaning+of+underestimate+in+english
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001633c.bin
4dd5a5b8cdfdd8d243dba6dfc8c232a590e8ec574924edf04a62398c0d24fb4b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1633C 24916 bytes
font_00_sfnt_off0000efea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 16792 bytes
font_01_sfnt_off00010801.bin
75fab63dee6c7e6dcd34120ba4e2fcebcce748a22d9d78019c6432c2117c3d7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 10896 bytes
font_02_sfnt_off000120c5.bin
6bd3daa2c8c4fce397568f449eaa0c67a7585dbd20c71214c26d9ac0ff682323		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120C5 28260 bytes
font_04_sfnt_off000191c1.bin
eac36f6552e6e24ff453eaa659ba339c22974b6d1cd5f582bbe1a3e8f969d41f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x191C1 6000 bytes

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