Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef279db7a681faf7…

MALICIOUS

PDF

74.6 KB Created: 2021-06-28 13:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29850e6ebb16aa3eeb2329fef5fb1397 SHA-1: 4140ca21fd2365fdd68b4f10f9a14a4710578c66 SHA-256: ef279db7a681faf73d06bb2dbb63a118034143a3a7baddfac40991f74455ccc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting it is used to redirect users to phishing pages or download further malware. No scripts were extracted, but the structure and URL patterns are strongly indicative of a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://laborke.ru/uplcv?utm_term=cost+accounting+ts+reddy+solutions PDF link annotation
    • https://ubranni.com/uploader/files/xegamusetenilisobotusoda.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/58888998617.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8aaeb98aca99f10a5ab665a1669d15d5/tawaji.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e7d548f4b72b8a7e7a1b02041016bbe7/vewulimisogilupazagoxeniv.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca2cf9522b---54121990772.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec3c82455---1225210.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/grbes1fv8l1c0lk8eq1rc9l21i/2533657999.pdfIn PDF document text
    • http://debden.org/userfiles/file/34735257308.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/lubaputipazinosunisajiti.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/silukutofivanunidekipawes.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e4b6da855---wuxufepebaxuzosalejixur.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5bf15364d8701615b2bb6f5844078614/wojusekotobexumorojebano.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/novagemexor.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/65ke6811hm7s9o1kdfpgdhmd40/84807797242.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/22dcefb3d63f90bc6da5517a9cd15d18/mogagazavaxirumevogabilin.pdfIn PDF document text
    • http://screen.by/images/file/1782970832.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/99373661222.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/0035cc562295b9a26033f35f8787755c/73447048052.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7360e638f---wepidixexifamolerobowi.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/jodiwota.pdfIn PDF document text
    • http://zatacorp.com/upload/files/nagelagikijimilumojasano.pdfIn PDF document text
    • https://mattress-leader.com/media/rinabipe.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/8btiq77ktp76p1vv6qjcqnav62/mexirevuxefifu.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/e1ac7924ea29c4a4a5070b57755c70c7/zuserunodosapiruwo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6n4rdlo7hirrrcsgq80inbslku/simisufokor.pdfIn PDF document text
    • http://eventechsite.com/files/files/25847867751.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210503080725133.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_off0000c05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 10788 bytes
SHA-256: 75ee4de2227129a4612175c4bb87ca5af265c8e9705dda7e12f2e7e4d51dc595
font_02_sfnt_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 16808 bytes
SHA-256: aa5ab06c02b4ee35b6ddf023b5c39a04863f047b3adbce4d470427fddc1161fa

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