Malicious PDF — malware analysis report

Static analysis result for SHA-256 027ba310688e7839…

MALICIOUS

PDF

91.7 KB Created: 2021-06-30 10:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b6ddcb8252ab14bbf5436036c7caf712 SHA-1: 0721931436598da9d1bc5e506724c9664da7122d SHA-256: 027ba310688e7839d7b1014b259706660e1741ab89fd92ba618c058c2bcacf0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://uniontend.com/userfiles/files/zitozojubug.pdf In PDF document text
    • http://madiagranitosilano.it/userfiles/files/wagokerowukar.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/nigimefimatu.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7e614b91---10030475552.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e3018c643fca8814cc1dab68631fb344/gogipipukevoxur.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16078fdf9bbffd---43618431397.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073519fc92e7---51989427409.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/xiguketaxurebekadewelutex.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/68755411760a26fa7736c9.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/71776842185.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/kusibubipetubosasamunubo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/48c5a27fcc0f42fcf609e4d13c6405aa/14745482230.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/4816887734.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/rugavufe.pdfIn PDF document text
    • http://marymo.ru/uploads/files/mejim.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/6iq13bilbunceov0cj4i8ofrpj/5173097320.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/39728418289.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/viguzu.pdfIn PDF document text
    • http://kasargod.net/uploads/file/modiwigo.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ba7d1b3311b89074476c50f924cd0e9d/6620852784.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/jilexisage.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/kupal.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/rejabezagiwobo.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/foxuvexalinoxiwemekerimaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=words+the+priest+says+at+a+weddingPDF 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_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 10816 bytes
SHA-256: 9142d1cd7aa15885634a717a4042e9adfa58302fce82eb2765efe0bcfdde4351
font_01_sfnt_off00011bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCA 17352 bytes
SHA-256: fe9157d8e2659233873fa3dc3b806e4152a31eda5602172a930ea4b822bbc6a0
font_02_sfnt_off00014942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1