Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f645f6dba4ec53…

MALICIOUS

PDF

94.8 KB Created: 2021-07-25 01:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e9c5191b339c1044094ddca925eba692 SHA-1: 539ac250dfaa0e088259f9fe658ca75074f5da2d SHA-256: 69f645f6dba4ec537d2d7a3e9aeb1de4ae2b0b87a7a0a35694837ec36f82dac6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall heuristic firings indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11ede4bd8---tosuw.pdf In PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/66ceec0bffd186622604c8ecff189570/34035645233.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/5497488326.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/13638277668.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/41886636748.pdfIn PDF document text
    • http://bronia.org/userfiles/file/63509328776.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8d8d0d17---pulakujigume.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0ebb262d3595567179f096603b8c197a/10879884817.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jho35ncmcp6tch0uesjs950rm1/zaxab.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/bd8526a8216fe318bbaa39de50bf315c/rabivure.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/45991307200.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/33832356176.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080c8e9ab21f---zezefobejunevobamuniselux.pdfIn PDF document text
    • http://maidichike.com/upload/files/gozosikasodixilobum.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b4599e079f077e9ebcb246463509d03b/tufajek.pdfIn PDF document text
    • http://gsoutreach.net/clients/e/ea/ea4f28bd0b090870cbed8536b6d1d406/File/salowepitajex.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/59d81db8ce8d2eaa41837c94d94a453f/pimimajeme.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/31823447765.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/lokine.pdfIn PDF document text
    • http://contactconfiance.com/files/files/59311938131.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/mimasinasinalatoviripipuz.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8632673663ffeeaa44e4a0c629a6066b/danamumupaxegi.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c8518e396e0ed1aa17e770578e5a8f38/kebenibixoninufumonopa.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/9805081008.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/310a5b6de1fb62a045f25b690e030980/wuxujejametizegogodom.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/23471064014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+are+the+9+types+of+personality+disordersPDF 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_off000111ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A11 16220 bytes
SHA-256: c9574e8e902d6bd04ff4f4a361634e7428e3b8aae57660584e13a22a5fbe55b8
font_02_sfnt_off000153fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153FB 10872 bytes
SHA-256: a1e1c591fd8154cdc9babda86771572d9bb123164388949b97d4a929f2e59b2d

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