Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37fa73586064510…

MALICIOUS

PDF

89.4 KB Created: 2021-07-06 11:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c2c2c1e2b3f2190dcf65ecb80906fcc8 SHA-1: 2cad7a478e7108bb1b1102635e32694f3a411a67 SHA-256: c37fa73586064510b9838868e29cc9bbee2007c849957c598dd95debaca4a04a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allcreaturesinc.com/files/files/zazekesotu.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/639783dfc3e8e30c8c73623f07a6e2f8/34147967785.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc18f5d2da---gebux.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/dirubololipe.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/35193342658.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ac816e2b8db9d44dc7cc7cf21869cfb7/45198854092.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/zudabexivuf.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/bosedagimujafibudo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0e99539cd---13862557998.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/riselebutufusepadufasuw.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/befuwixamifosetafuka.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ikhbqe0ju3t9v0eman51ddjop3/zutimiroxatiforugine.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/129d654938e059f673a9d950b3262e0f/fizotekulijad.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/buxuk.pdfIn PDF document text
    • https://aashianarealty.com/file/viwubowavalovutusagogidij.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/46981336662.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/d1450c7184c16169c41bf0c8f7210330/91231318545.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/wafapinufawobiwu.pdfIn PDF document text
    • https://davaocarrental.com/images/file/befenuduxiravunaxosadot.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a7197959de6ecfea6f647cdd90c3c8fc/63384532898.pdfIn PDF document text
    • https://media-get.com/userfiles/files/sabanekiza.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/98902354854.pdfIn PDF document text
    • http://turnyras.lt/Files/file/kizuwopimob.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/qd0ge6v63iktl8ri1fj5n8h067/xarodubipik.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34850e1d08---65675021701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=word+of+mouth+prPDF 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_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 10152 bytes
SHA-256: 75fa6c0c55b10a2a01545a804b6bc84dcdacdbaf52d602767b886dca6fd1e05c
font_01_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 18084 bytes
SHA-256: 9c6fb78036523a12bb3be75baf0a627ee8cbe01c163ba97f2e652c7ca9fddc6e
font_02_sfnt_off00014036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1