Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a1f6acfb6afb08…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 08:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a353df2b1930ae71811e340e5c57945c SHA-1: 1e2a81c67a7a397de130f5be2da7a6f931b781f3 SHA-256: 09a1f6acfb6afb0865d2742e5e64eb42ad681cdf3ca68d83586fb6685e668818
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting a distribution point for further malicious content. The presence of embedded URLs and the nature of the link farm indicate an attempt to direct users to malicious sites or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://soechi.net/userfiles/file/mosib.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/16a3e17c93b02f113ac0f64d63c8ab02/vijezidamajajisojepem.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/fa8c9a97ea3b979f7d13341eadd566e2/55770978127.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9264c448c088524297df41cb3df800f9/bezubawizadonovexabomejoj.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/c2ecf559bb52dd8b45b0b8c1a592b8e8/latuvazu.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/22020618679.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/ribijogig.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/53932814548.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/44626256692.pdfIn PDF document text
    • http://orlickachata.cz/files/files/7872253387.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/32350813187.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/1167870028.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/dm9btm7bifa54l4kerb92g7k43/jumakulaxatujunivuk.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/3ba8d1722fa5ddfe7517cac26fdc6f7f/wegaxomanuwupefafibipi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab38a16f196---41813557054.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/repidavorezifakab.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/basafomokazexeg.pdfIn PDF document text
    • https://fobh.net/userfiles/files/nuliz.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/24491808208.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93a826a2b0---16919680663.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/8593613677.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/76956033754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=kirby+morgan+27+manualPDF 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_off0000bb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB19 10568 bytes
SHA-256: 2aeca6f9bacf2770c35234bd4d0f46d646ac050078ebd1264b88323737231e99
font_01_sfnt_off0000d331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD331 17252 bytes
SHA-256: 85391c2cce941ac5cf8c49f0b6ca3098677c8c81285d0579a226474bb661fd9c
font_02_sfnt_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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