Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4670db8869897c…

MALICIOUS

PDF

81.8 KB Created: 2021-08-17 08:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 236b308c58043f5133c3ae9b6adbaae0 SHA-1: 6910d7357706002209a96ac5af0ad6739fa5f47c SHA-256: ec4670db8869897c84cdbeaf929545b53f1a8df29373bd20af66626ef3ce1ca6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs pointing to compromised WordPress uploads and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URLs are indicative of a common PDF-based redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=diary+of+a+wimpy+kid+double+down+ebook+free PDF link annotation
    • https://sanvexe.vn/webroot/img/files/lofowubafi.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/fazotoxipaxegamekuvoxu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fedbdb2ca---50161052622.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/usqcdk3i9g62ri43ucqmiri1tg/nisowojarepuzaxarasivi.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/95783696280.pdfIn PDF document text
    • http://www.asslar.de/downloads/31207683328.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/u6g1phkijqeu1kgv9b9tuueakc/78986929480.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/melik.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/4358080939.pdfIn PDF document text
    • https://mfdesign.hu/files/file/supofa.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/deketawixanu.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/39869985193.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/varepazikixepab.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/30247238951.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/b7e9c2b92bd66839af0cf0989c0fe3f0/66230940025.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4a4248989---novejafiwalol.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/zugodi.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/newibedilimubefurorexav.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/17567215514.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/44694651216.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/72038394460.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a790220800f---kapesojepagefotaloxizef.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/6j6u9uk2bth8htr3366j6pcj92/notepovu.pdfIn PDF document text
    • 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_off0000da03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 10924 bytes
SHA-256: a0917861dc13d18ffa792fe133d71ac99fc1aa47fe528a626d7f22069ccd11c3
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 17376 bytes
SHA-256: 993119a0f92bfef324645147a903fe08db05faa06c40157275d362d8bc338b9c
font_02_sfnt_off00012103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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