Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d74827c3385d5b…

MALICIOUS

PDF

96.1 KB Created: 2021-07-23 18:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d047b1eff1987a7b60e9a8e6c0f1c0f0 SHA-1: cdb870d5c5d6932fac158295b469160a40995fc3 SHA-256: 26d74827c3385d5b626c5f35021d86adf036514dba5aa22491a097928229507d
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://cailux.lu/userfiles/files/mejexetivorabifamasoxoli.pdf In PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/jjrb00p34suf9tsvdbslr7c0j0/11233522837.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/69c6f9ef80cf3b6101715a0e62c464c4/moxesukog.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e18bf0f63be0ae3f8549685c691c1b6e/wumosuw.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3dc354ca1---gonobel.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d049711d40b---28376887149.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a77a271a961---xozipanixani.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/85943361153.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/wigagukowufimawumomojizo.pdfIn PDF document text
    • http://absigorta.com/E/file/75416554623.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4cd69757d8c22bff2923a10c20a9de16/xovure.pdfIn PDF document text
    • http://fitviewer.de/files/file/9701145488.pdfIn PDF document text
    • http://alvitraders.com/files/91252365614.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/sejafad.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/bivola.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ra3cts3pblu53mef5c8s1u56a5/71377753840.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087b837cbaa7---58921780213.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/taperajawesitalite.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/b20209165bdfe28829a0e58c0bec8b2a/62554757449.pdfIn PDF document text
    • https://norservis.com/files/files/tisegiperetavifoxivibibe.pdfIn PDF document text
    • http://anpo.vn/upload/files/92034669549.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071110cb220a---xifol.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/86215899414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=antsy+pants+fire+truck+tent+instructionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 19696 bytes
SHA-256: 8d82c054dd2b2e2c9f1baf8cd68e1c14cd9bb907252feb28483fd28084a2106b
font_01_sfnt_off00012a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A06 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off00014011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15828 10712 bytes
SHA-256: b61d6b9d138a166307d8b715066008412f08883cb2ef05e9e8cc31f1a8ebe456