Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f41579822b47f0d…

MALICIOUS

PDF

84.7 KB Created: 2021-07-27 17:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 73140b9121ea3f1684842fcbfeaf7773 SHA-1: 1d016acb49a9261004bc43ce5e32403d4ec61f98 SHA-256: 1f41579822b47f0daacef80be221ee0b3f04911e390254c6860796e5ef36a285
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://acryl-bg.com/userfiles/file/63074476501.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4a8e4c13cd9a9824753658d1a8f23c49/dasebabikiko.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/xoxetavin.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/39d927e5465cb3df7a3a426a9f454dd5/waposutibalipa.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/siweb.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/litefaxunupasobefilo.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/77973565691.pdfIn PDF document text
    • https://dm288.com/slicice/file/jutemup.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe19375e51---24468137903.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/41436515928.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/11910777910.pdfIn PDF document text
    • https://amblamy.ee/upload/file/xegisozusetopefetexonofat.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2eecfe4307---lozisorogagubix.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/d17ec3c5d42a005110e1f33f4b56412b/59376607792.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/56328249301.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/65709811217.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083320558578---20734563508.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eab4d8f22a---wosur.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33e83833f0---sibulinor.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4074ccfa92---lerabi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a0c85a3bc---15392167432.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160801084e4274---binogufeze.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/ad97e10763e0b6f1bbe81c16bcfead2c/68414306537.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/66544370612.pdfIn PDF document text
    • https://megashina24.ru/files/files/18635757267.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/60296763455.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/56973532811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=euro+truck+simulator+2+bus+mod+apk+in+androidPDF 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_off0000e420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE420 10976 bytes
SHA-256: 8dc002e4ee18592540bf0e50f9209ddddf2db2b4cff9caddf3d8d4f16b8b8f21
font_01_sfnt_off0000fd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 17984 bytes
SHA-256: ab86a5ed14dac5d4d2f1b55b94db99b1d8273a2ebc92687d780a2966fbdb6089
font_02_sfnt_off00012c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1