Malicious PDF — malware analysis report

Static analysis result for SHA-256 67986a61a9e504d0…

MALICIOUS

PDF

85.1 KB Created: 2021-08-16 06:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 61288d2e0fe415a7a740a7d57b91777f SHA-1: 2b11ecb0fe72bbedef46d89bc24ca05bb8b0587f SHA-256: 67986a61a9e504d0f106fa432359615c0faf1f78d22b8aeb09e2fb1f082a458b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to multiple compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e8bc064f---73277173504.pdf In PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/98090059181.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/d083079a1e685ea9a3b7967727752312/33598935532.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/84573851444.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/da88d533d847d0be66d1c96183383099/wawif.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/vevokesezoludejuvuzezana.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/96232631258.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/kobowerofalut.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/sonukekob.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/4skhs0uc8c8e3afpmjgf1sj4q4/wegoluvanaxobomubona.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7483e9b428---34456581407.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e7c1b1036---pagifazijenotoxokefomuja.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/60460bf222feb475ec7212b3eb31046b/175944945.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/babififowodusewa.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/patikexuronijaxotosetefa.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/3681d30ea50ac14794bd4113914a9b8e/pevuzuxisud.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/8fd4762d508b4942c9a6701cbb32b0ea/dozuv.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/nahi3e9qfh5ajngtjp9udemd71/guvuvulalupevido.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/36131bc804c186d4802c58d1e22df149/17236857858.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/maranaxoreduwagebi.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/pegalowixelavib.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/tafalon.pdfIn PDF document text
    • http://metall-press.ru/files/7190646875.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/xoxugoruk.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725c64cf4a7---merurakape.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d82d980c70---kajilakajoseganipafora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=why+school+uniforms+should+be+wornPDF 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_off0000ea16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA16 10912 bytes
SHA-256: b73faebadaebc2e60b623cd39a954ba8efb9410f39bd64ed370a99167c6c99fe
font_01_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 16708 bytes
SHA-256: 8c9f7402c3d920a47f7e71bed746c1b63b6f1a2354a88f818234718b78a8d170
font_02_sfnt_off00012ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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