Malicious PDF — malware analysis report

Static analysis result for SHA-256 9005e590897aa0f2…

MALICIOUS

PDF

69.4 KB Created: 2021-09-14 00:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e24e95b5b30c242a0861fdfaa6dd9070 SHA-1: d0e1bef9e2b1aab157bb71226f26edac6266db71 SHA-256: 9005e590897aa0f2685011495ecaff203cfa5bce553b9961863041b9721f7992
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Several heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and potentially disposable hosting. The embedded URLs, while some are marked benign, are part of a pattern to redirect users to external sites, consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://cameragiaminh.com/upload/files/wuwotetedapifo.pdf In PDF document text
    • http://tagsu.com/attachments/fckattachments/file/69181370532.pdfIn PDF document text
    • http://tradotel-riviera.com/file/61048219737.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/dotetezajoxukaduduwemuz.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/40399425927.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fab714c6f6---82805625297.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/82309015945.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/7056864380.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/wunikonamuzosen.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/mukezo.pdfIn PDF document text
    • http://schubert-hh.de/image/file/jisapagemezinavonis.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/64790091201.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/36312741584.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/q58hsc6mhg78sh1uu7pii7jlfq/siwag.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210908161107_mz25j6.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da45bb578d---15017737183.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/4227193574.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/fedowumedinubisimukivuj.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/84525202646.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305976b92f2---98685396572.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dadb86587a---7584679587.pdfIn PDF document text
    • http://entrackintl.com/uploads/34481009231.pdfIn PDF document text
    • http://cochemical.com/upload/files/diwabagisaleperiz.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/34480718773.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/gufafexaralibodigeru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=xollu+movie+app+free+downloadPDF 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_off0000b3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AE 14268 bytes
SHA-256: a04c3bc56ce326e788705f19b6f257596da0d6c8c9563b902d08e374cd96947e
font_01_sfnt_off0000d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 10652 bytes
SHA-256: b391f98a28fa60b065a31307c1cd698e239f66b126c41b46985fafa6ddb019b7