Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2772d72cc8d5ea7…

MALICIOUS

PDF

87.7 KB Created: 2021-06-29 09:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d64f8118ca3ce493b79867bd8353a1cb SHA-1: c029a2092530a207351358105cbc212cc7054438 SHA-256: b2772d72cc8d5ea7c866c38ad33cd72f8d8898f98352990044980d8fe8b7db31
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which appear to be WordPress installations hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to these compromised sites for further exploitation or phishing. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kwartetproforma.com/userfiles/file/raxodinosinabubofigut.pdf In PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ac723c56---30585351399.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aaf88766e---91354015050.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a457b0bfe1e---17533020450.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/f9d2cea959209da7941997de8bda6413/robulebefabare.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb439d7446c---33576535272.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/52100733273.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a6ae323f1---binobazepa.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/khj839iemua34s8k3fofacpuv1/bakifupi.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc99b8e6b3a---fixuterude.pdfIn PDF document text
    • https://x-software.cz/data/file/82621295563.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ovqkcdgubdrv6j2echhs184jc7/nuduluperokasuzekiwipaze.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/mevazumo.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/265e7d0e118a69ec138af46955d8bafd/37450665075.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/wilawoxowavolilibavov.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ko0ruk3a4b5cku9snlbe2179r/julavuxevof.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/busikuj.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/21899410565.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1e04840c3b8401bfd98a591784d1f118/samiwaremaluwavivexusu.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091908b725bb---nisixuxifutofolizis.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948515c2452---togofudodivapezitonijobag.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/piwapedenosexusarizejaw.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/af4ea716e82d01024fbd04fad05eb4c3/66551126064.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/dc1smfae835pq10vfgfcfjj1qt/87672115903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=surface+area+of+right+circular+conePDF 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_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 10624 bytes
SHA-256: 8c59f6d59859ab05f676f5cf916ca924c3cfda8b465c757dc89dfb692b8bc309
font_01_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 18300 bytes
SHA-256: 408dee8842ce38b1f369210eb2632af4a823d0d7c5e29812eeca28351362dc7e
font_02_sfnt_off0001397a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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