Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb415373b6b35c04…

MALICIOUS

PDF

123.3 KB Created: 2021-09-06 23:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f18289a2f8ee6c2b4e4137648e02980a SHA-1: 8378663af8a8d549cd65b89d608f66f209f6e488 SHA-256: eb415373b6b35c04dccb920be626d4979d9eecccca217ef4a4b3a275a70b7dbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://ketchas.ru/uplcv?utm_term=bazooka+bta8250d+manual PDF link annotation
    • https://pjkconstruction.ca/images/file/mivegijorezirupazete.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/sojowosimidugirepo.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8130cde77---60389079801.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/5821027519.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/21287883856.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/24c1cf7608c26292ee55e411646a8b91/diketasug.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/j2n5a8nou3k85fu3nii6g1cvv3/23514583627.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/74db9f6638dd7c624f7b3820c840b8f6/83248694674.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/nigob.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-28/20210428232236911385.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/pezapuwutaxino.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888ffd50d21---33975524505.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/75483060731.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/77087776426.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6ad574b60---55989812197.pdfIn PDF document text
    • https://congchung7.com/upload/file/fimojebafosefa.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d0933e05984627c90676f5dabca00df5/zilatubuwovalogos.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/86454651331.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc1ea3638b---vawaranekimexiwuzawalej.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/34280410538.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/42321448324.pdfIn PDF document text
    • https://jurad.eu/files/file/doxusut.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976d0814462---jadapurugegek.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/12828490908.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nowopanof.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/zologopumovosopu.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_off00017bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BD4 10948 bytes
SHA-256: 8a69d3734022f95e0d5974e5e9e1e1da471817f2426cc98766ed3a15e67c26e9
font_01_sfnt_off00019551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19551 19040 bytes
SHA-256: 7967cac526cebc2ac387957992f8e4eb4c90b5a381ab647526f9cc77c75fc566
font_02_sfnt_off0001c6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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