Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b53852022f481f…

MALICIOUS

PDF

83.4 KB Created: 2021-08-19 10:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c79f1fa3348684613b570a542e2bac16 SHA-1: 118dc8b7c0a64081d14d030790b6374cf3508899 SHA-256: a5b53852022f481fe81c04252283e500c4b692a101759b0e2a2c2cb875550209
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to external sites, many of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://queure.ru/uplcv?utm_term=%D0%BF%D0%BE%D0%B7%D0%B4%D1%80%D0%B0%D0%B2%D0%BB%D0%B5%D0%BD%D0%B8%D1%8F+%D1%81+%D0%B4%D0%BD%D0%B5%D0%BC+%D1%80%D0%BE%D0%B6%D0%B4%D0%B5%D0%BD%D0%B8%D1%8F+%D0%B2+%D1%81%D1%82%D0%B8%D1%85%D0%B0%D1%85+%D0%BF%D1%80%D0%B8%D0%BA%D0%BE%D0%BB%D1%8C%D0%BD%D1%8B%D0%B5+%D0%BC%D1%83%D0%B6%D1%87%D0%B8%D0%BD%D0%B5 PDF link annotation
    • http://status-go.net/gfx/userfiles/files/pidixo.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/nuvijadotedisomirix.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/tupujuziforenabebusejox.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16071228a4bb94---namizotenot.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/fijimasanusefiwax.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a96164911c3---xobosaxaxag.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/35326309821.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202172343193055.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/84248516753.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3539ef111---88791516694.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8bd6627a9---xewixumapedepanat.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/vejofemururaxuponugux.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/niniworepinoluvafa.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945fea72305---57064333753.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070b913910ee---vomegopelorevitufod.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/konuxakalulevojages.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/fomurivij.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210819_D17D2CC9F2A10BC5.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/dc945f977fa978c2fd091c1bffe5a6a5/tovorosobeseluvujanamilub.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/7ef7b32e77f3ed3804c488349766dbc0/jezokixudema.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0185d091f437d30e9cf224d0e637f855/dagekiligajowo.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/90673661434.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_off0000d2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B6 22204 bytes
SHA-256: 29dfc229e79568452482d93f229640075958b885c9d2a2837e674f7bb6295ba6
font_01_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 11548 bytes
SHA-256: ed2373cf5969c5e40d17eb24d30a1fe07cd4446193cfa0d267288156c6f5beaf
font_02_sfnt_off00012417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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