Malicious PDF — malware analysis report

Static analysis result for SHA-256 a667d2bc7024bca1…

MALICIOUS

PDF

75.1 KB Created: 2021-06-26 02:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8d5ecf8268656f5337cd1b74f0101928 SHA-1: 61d1503bfc4309257d0a5002482ba451ec4040b1 SHA-256: a667d2bc7024bca1054b174d9d14ddca4efa70ffa85122d80177a8de299e97b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ibb55j7gdsis2viida2n88tb33/82220843353.pdf In PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/8032992154b9bf3255be0d51e84f9180/sabidobusewagurumufoner.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9357797e---29991309969.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/50328394401.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/qtqafn7d8eqgpillghra2h4lqa/rabisuvulipegitaduwaj.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/23c89b24c8c36eb4fb8eb1c1143cd6cb/fuwiliperidikesidutemog.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/tafowobunupefodamolopa.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/e9081d1c85a35a513edf40eab4201e1f/66184707058.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/32744591479.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608493aa21752---61098486012.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160859970b6e46---53808115272.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/javukasazanadedinenax.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80f8e6ae41---19978827633.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946c84318c1---zosor.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d602dff72---denikupigig.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/vunamoligupawodimugereg.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a3962621207---1107083491.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da7252fab4---nuxakemodi.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/8543774647.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080b6236c517---supanulivusakasexopanawu.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/68782837946.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/kibofuxiluremevadifimob.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210515015929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+is+a+benderPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 15984 bytes
SHA-256: 45b84cfffaa7aeba6bc72e25893ab94024ce339037e06d8c317225b760dc8c4d
font_02_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 10312 bytes
SHA-256: 2d885d8003cb5ffe06fb86d62f5e4afb5719dae13a78efc0803cf7bc06277a4f

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