Malicious PDF — malware analysis report

Static analysis result for SHA-256 04370d7e50b28f13…

MALICIOUS

PDF

88.3 KB Created: 2021-08-05 06:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2432882f3e4b6e41f04cd85c70b0da61 SHA-1: e5ec94301b4b638f217dedbe8f261c4d7f452474 SHA-256: 04370d7e50b28f1303694aeb490bd6ee4ae67ca55590d958fe53aa23613fc764
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nomylo.ru/uplcv?utm_term=best+buy+store+credit+card+credit+score PDF link annotation
    • https://grdr.org/paidel/ckfinder/userfiles/files/28808230330.pdfIn PDF document text
    • http://derma-dts.de/files/file/wesaf.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/73978066387.pdfIn PDF document text
    • http://jouezadomicile.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/68147898373.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160763638c41b4---14798381899.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/50010674989.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/37917101742.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/zavaliku.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/relisik.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/noresejonideke.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b6ebb229ec1ad19cfdd430e41cf124da/vemunelevaxobalaxogobolip.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e656f05cdb---28135428628.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/10826613649.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/jejakafasi.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/92255851750.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b9bd7cde7a1c44c4eb356fd132aca91c/71582579633.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa4ac485d---66227688968.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/rokononafi.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/35062345201.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/pewalodidiwa.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d626f2084a---nisosukokibomidijav.pdfIn PDF document text
    • 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_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 10620 bytes
SHA-256: 879c66e9785d170f462dc3d266fea12cef9ea13fa997c19a94b2eb5bc5754904
font_01_sfnt_off00010e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 17000 bytes
SHA-256: b78abdbb3267f595d387da50b4a4da97f4d48f93d76313891a7dae6ec46b0983