Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ee37e8be2b3770…

MALICIOUS

PDF

89.9 KB Created: 2021-08-09 09:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec552cf4fee794d50125c0c17701949d SHA-1: 03a289b2a1d8f169496b2d43164b8a42c3ed0528 SHA-256: c6ee37e8be2b377098bed188a313dd24f54ef29916e75147c5a1691efdc5a817
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 0.9932

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://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f171da9ad1---78245628836.pdf In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d779358a24c---51279971475.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/nokovuwuponafimarito.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607997203d341---1062925400.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/d0ceacac065273fb280a27f1533955a7/62618987743.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/60177299948.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/93st8i4s9khm9p9n9g7sbmjfr5/19049648024.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda6baabe19---41074097244.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c83dd01ba---36594619010.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/14a03f7368146cd40c71234567b3a0b1/73885572114.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/jekilozaxokewagoxepim.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/45081556493.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/41886934170.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e01266c0381f58dd65f5c5a31ec254d0/lixilesox.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3e1493709---27554790631.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/23ea35ee17119ccdc2d98e9cc864fe2c/nomatokozela.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/wakelavirasi.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/bedisogunebofugujopozekuj.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/lipowopikulipodejoso.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c99f56672b---96197063535.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/maxugunexevonibaros.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/40898305397.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/58668149812.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/t32dk59uiegfi09g220f2ftoqs/25071592512.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/f3te5tkndn86fl7q5ueuv3l7m3/zuzawupi.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/wumafagoberitigusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+set+up+airtv+playerPDF 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_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 10500 bytes
SHA-256: ab33189eda0442af7a447db4424f52836d94ee39cb717a47810675fbfe1f4d73
font_01_sfnt_off000114cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 16988 bytes
SHA-256: 9a46475461cd17bd791ac279b01bd0478c707a3b4ab5c18afa222ae27faaac37
font_02_sfnt_off000140f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1