Malicious PDF — malware analysis report

Static analysis result for SHA-256 6250195e5d0cde9f…

MALICIOUS

PDF

118.9 KB Created: 2021-09-14 06:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3b1346e1a93dce3e1de69bbaa1d8ad21 SHA-1: 632fe2fb046ac8b98a411ed8549012e886044fb8 SHA-256: 6250195e5d0cde9fa4776272a2b0ea42e4011b3003910242e492f02bb4113e81
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 0.9974

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://ayurveda-shiatsu-qigong-nice.com/upload/files/82768904900.pdf In PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/heip5jr0sl19tism7p03vql306/90196006477.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/rogugisorifizitarigasi.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/sudorekutupigebinizu.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/52367699928.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/93992891356.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/092f27cfc3f9726761109f6e224bc9f0/98968259791.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7c9bff0db15e241f893fb41a50854c80/zifid.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/wevekufexutazimuzidosuko.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/rebibovimumobunas.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/98946140284.pdfIn PDF document text
    • https://faceless.me/userfiles/files/68960451404.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/zisoxitupov.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/wirarasab.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/domaxuk.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5c2ce6aa481328e62766c606b2625278/sizunikuzewukakowafaf.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a1f668cad47acd0e0de4ed0fbca756a8/65474394287.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/23549114137.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/vipibajitabudo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2a7190f0---36298233429.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/45812800003.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/72951635950.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/14181270388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=nintendo+gameboy+advance+romsPDF 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_off00016e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E7E 10964 bytes
SHA-256: a892ad3ef35f36d7fb978eda2d2075e82b4e2ef03a5761cfb762da1cb6839a8b
font_01_sfnt_off000187c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187C0 17872 bytes
SHA-256: 0f3854d217c54892c6925ccb96e2a1b77399e353876295388d38612bee1df7ba
font_02_sfnt_off0001b5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1