Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b4afc4e666918b…

MALICIOUS

PDF

72.9 KB Created: 2021-09-04 07:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a79651ca7f4308b2fca6bf36c962230a SHA-1: 30ad427122033b1743222d765039c78ec4b1448b SHA-256: 04b4afc4e666918b6fe7caa22ef8e281e4410b59aa7f34f344f34cbce4452c58
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs are designed to appear as legitimate content but lead to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/sejulogijofonepavugip.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607901e21196f---wojusapujipomades.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/92089483029.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/o0p99q1u90ituoomq8580fvr4u/665100892.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/3394089287.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/77867901152.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/78123030980.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d30a3564a3---pewuwikaxutuleni.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/bujegovusepidebil.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/85156568234.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/707f3fe6df203b78ebda7fdbff381197/65046870155.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/zironafimi.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/91131326379.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/72770978463.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c013939d9f57a0d8d92dce8bed8f5000/85383870172.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2ad8ea6b---68731687527.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c32e84caa---dikifudulewosatoze.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/nirimanep.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/dowumefafapomoxa.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/zizifelivigifakamo.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/71447305811.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/50521577476.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/safalitujaguvowawibonak.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/32238137556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=limit+of+greatest+integer+function+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_off0000b81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81A 17468 bytes
SHA-256: 474f92bfd17f750cecf162191b03999ae3a212d5e5613b4be3582b6f13538862
font_01_sfnt_off0000e4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 10976 bytes
SHA-256: 3ce1c506d4a050780787e43e0413dcffcd1f1b575b6b0cb8ca73a7918e7b15bf
font_02_sfnt_off0000fe18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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