Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f88788bf14c379…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 03:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4a7f8d7f0fd580b8d5497fc312892c0b SHA-1: 461f01cba009c21e575a256ecc5edeffc89edd12 SHA-256: a3f88788bf14c379a4ac6d40191ff06bc52242f6b39664fc56714b16acf1c708
216 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised websites, designed to lure users into downloading malicious files. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may also attempt to trick users into revealing sensitive information such as private keys or backup codes. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/en2oefv0fvk6q4flad910dv71p/83747954954.pdf In PDF document text
    • http://zekidilektekstil.com/images_upload/files/zavege.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/17634521135.pdfIn PDF document text
    • http://short-story.ru/upload/file/keposodisuzigegedazol.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/betikaf.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/puvonumagonitinidinazoz.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/71a0ec18c14cc929dc71cb509b2b4f4b/34893076853.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930aa2e952c---93933683222.pdfIn PDF document text
    • http://packamate.com/userfiles/dekagepu.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/nusiwidokekaz.pdfIn PDF document text
    • http://hongdacable.com/d/files/6795568184.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/lisavobotura.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/44442016345.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/e580fb3f022617a19e57d4590fb15d5c/zugirafawezapi.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/96369649461.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/aqboqms8caamjkm2l2dvvhqnur/90831100772.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/dapepaweke.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/ruweburamu.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/dozisuli.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/16352113848.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/jirimetokow.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/fukimixebapiguni.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/41976375663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=adobe+pdf+reader+7+free+download+for+windows+xpPDF 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_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 17392 bytes
SHA-256: 1aebf04f4bddf8004cbc39be111d0b5be62f8b37a3f35ebd5ef4f671e05b7463
font_01_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 10752 bytes
SHA-256: 8c53bf79afd646e4383f156837c77dff76745643ede01eeb669298dfa3ec4fe9
font_02_sfnt_off000120b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1