Malicious PDF — malware analysis report

Static analysis result for SHA-256 435f67f2cf77ea67…

MALICIOUS

PDF

98.1 KB Created: 2021-09-18 16:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e986279752aef52a5aa8d2d96123fa8f SHA-1: 980b12517fa1d92d8f37b5dab3e5c451eb4d0b31 SHA-256: 435f67f2cf77ea67e3e45f7fb488fceab1c33037532feb394a997cfd5992b9cd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress uploads and other disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=airdroid+control+phone PDF link annotation
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/35c3af7c13eaafc3f66080a6cb679242/berotovekegaxuwulo.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/naziwusetad.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/4816405758.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/42455041577.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/bodudesafekovanujo.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/18214170214.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/nokefilojex.pdfIn PDF document text
    • https://cristalensi.com/public/File/tofesoduw.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/39929735900.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109120518173600.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/gazutalefodibesazeda.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/53099809577.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/tojugavuxirirajamop.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/jugutemojemijag.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/37609814757.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401875efeb7---xelibonixiratikil.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613658875211f---sukajera.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/2202666457.pdfIn PDF document text
    • http://hadt.vn/upload/files/29207687572.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/jogad.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/73514071325.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/68528707158.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/podavuzebamewusimugizub.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_off00011cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB2 18304 bytes
SHA-256: 858c78366f4190febccf181478b322dd0aa55a93700810cd922a2c3c2dfa2a1c
font_01_sfnt_off00014bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD1 10264 bytes
SHA-256: 2928dadf8bdebe8bc9b5b9955407a6725827451cda43fc14b5e9c67c7ee5f163
font_02_sfnt_off000162ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1