Malicious PDF — malware analysis report

Static analysis result for SHA-256 781f53a20c4da1db…

MALICIOUS

PDF

83.8 KB Created: 2021-06-28 07:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2889492d1de92464c82f848014ae5fa5 SHA-1: 13f91b88a210067afa0a99d54f4096a5f912ddbf SHA-256: 781f53a20c4da1db013ea4cc71e4da170214d07c4be1a151cea8c8fa57ded800
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715039034be---muxejepumuxotafel.pdf In PDF document text
    • https://morganmethod.com/ci/userfiles/files/zarusifubenalo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160872e2c41ea3---90608651499.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/70769360941.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/78021248988.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2eed0b99f32cbc9a9809825acac857a1/ditodami.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/1a82618b5a588c49c3ce4aa9d0ddaefe/lonawomozevorakagezagobuz.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609414db1aed5---20533096394.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/gipalope.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/rinijenuzirokefamovijino.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/0788a905cb96b665670f18f9780a8f01/34693392396.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d652a66c1d---nomutikepodaketazexojaw.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/pebepewuzepabufikimoragap.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608626a035bc4---vixofoxakawevofud.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/4540f24b9abd68aecc5cb33ab48d4579/puruzozedowubaromib.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a4cfa6c40---42564477992.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f687bc527---nedidirefevu.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b5fa07f2d---71073173951.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/3oad0r0lll0ptb6a7r84gqcghb/totabij.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4baf41a79---95825397846.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/77473379518.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/rueidijuoj5d35bu1rdmkal80f/20637499733.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b6ce75ca8---ligefaforab.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/kenemogozud.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080a17191bde---xogulefixikeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ali+baba+and+the+forty+thieves+oxford+pdfPDF 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_off0000c5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C8 11000 bytes
SHA-256: 13dda2ce675f894e5d8b650f89ac97a53babce1c5720f12cf1ef9802100cf3cd
font_01_sfnt_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 19004 bytes
SHA-256: 544194ff42380f997a32bdf2b85e6e72f42e3dda9b6c3bba3d39fa99694ad290
font_02_sfnt_off0000fd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 17024 bytes
SHA-256: d11b0b12e0eef93959bb2b71412f26b2d139ef4652e9e1ad7857bb11c6551904