Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec46f7e63eaf6ea…

MALICIOUS

PDF

79.8 KB Created: 2021-07-23 21:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab713b47581fd0aca490f87ef3f000e1 SHA-1: 6e4b65f01f122bc29bcf1b3d901c643d75aa0312 SHA-256: 8ec46f7e63eaf6ea66ab3b61acefa2f68c5dc7a0cac272cb5d18427ea322ed16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/28c94ed21495f71d42a9111a33a209d4/zejumituzademadovagofosal.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac86b34a1e---42704220945.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac271943fb2---39486668204.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/kazubadira.pdfIn PDF document text
    • http://iltorg.ru/upload/file/dadumotiwuridudaxixo.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d9071c4d0---66916440746.pdfIn PDF document text
    • https://aashianarealty.com/file/fexikazep.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5fee4267e58183b73e9e8da772c6d2e5/jawokowe.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adfdd69618---guwemipoliv.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3820136b30bf2f5bf661972694bafcd9/66334989305.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/bedugemarejipifi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00da39040c---gerosaxalapomipijofe.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/69219072503.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/73930087040.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/u0ahqu7rbi2140evqiph3los89/13614322515.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7455073c9d---87158828208.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/dewitezibof.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/rizobiribujoguwawupizife.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/8c314071c88b5676a88c98de0446f920/gomakirenugevuxoxapofu.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a161cd6c1b3---53534913642.pdfIn PDF document text
    • http://zatacorp.com/upload/files/63758215066.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a72522d25acb0ca0245b9a66b31366e5/delenoburezufidegavuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=automate+programmable+industriel+exercices+corrig%C3%A9s+pdfPDF 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_off0000cf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 17580 bytes
SHA-256: 9696ff4ee56f75c1f702471cda9160bed6de56023ae99ffdf9cf3da03b319d6a
font_02_sfnt_off0001148d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148D 11440 bytes
SHA-256: a830969b12d18ca53554cd69711258fd447860dea1feffb4a26c686ac777e6b7

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