Malicious PDF — malware analysis report

Static analysis result for SHA-256 6217e42265a4f6e9…

MALICIOUS

PDF

96.0 KB Created: 2021-07-07 20:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1d54a2944e7f08e7c164630118d0f7c5 SHA-1: 20c226cea45fb6a06e7f44561c06a1a1aba3e947 SHA-256: 6217e42265a4f6e9ed29c8c0f0cccb62fa61804075c9b13d0c59020682955cfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1fe214ed---32716617330.pdf In PDF document text
    • https://aspirans.com/files/file/83615705244.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/95790313462.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nocb25cnobisqppbgvce06e4q5/jalutap.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/bixozokajix.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c94f11c3feb---91310382883.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/kufixatarep.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be755c147e7---sezikiviwepaxage.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/13914905497.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/skrrc62cdg0hcabfq16rhkvkc2/xasabagatolamivabaguxo.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079c1991dc3c---vujururalix.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/tt51f0aebborjrrv268k7in9g3/jorewopejawixuwivem.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8uhcst0r2hnduk2qaf5807sfm5/96392193742.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/41b2fa110f5379b805340e0aec7f9ea6/26907202093.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a6c8ce12181046d369bfe3d8640d1972/16048853698.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/80963777730.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/31523625347.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/bd7366790a284ad1ada17a324e11cd91/wajivel.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712ba446708---balanonavilusitarik.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8370ca526c08893e5e7f245a7f5a3c9b/lulobeki.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/zupajadopesonovugizirez.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/hjsn7uvgka3hkgjnrccd1mgia4/fodotex.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ae2bb4ddad761aa21ba8755d97d97e7e/98299384026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=data+link+layer+examplesPDF 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_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 10604 bytes
SHA-256: 81059b06f7e68fa5216f1f1eaae137dc9d1e011b48b2aee873323684db1344f2
font_01_sfnt_off00012b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B39 17952 bytes
SHA-256: c86205d93dd7ffec800cd0f9c80de2b04f4edd3fa79132630b58d984889ad423
font_02_sfnt_off00015aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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