Malicious PDF — malware analysis report

Static analysis result for SHA-256 954aa55f6e241bfa…

MALICIOUS

PDF

91.9 KB Created: 2021-09-22 18:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e138b9cf8c544815e2d6488d5e5f972 SHA-1: f3fd4be620e433bfb4f167be8eee4f1617daa740 SHA-256: 954aa55f6e241bfa9d112be6a22871d8f98aa7f06c5a8bb3d2ff863346821ec0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically by employing a 'password-protected archive' pretext. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://queure.ru/uplcv?utm_term=come+creare+un+applicazione+android PDF link annotation
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f49ba64d466a7acb395785f4c4d98a0a/67210341822.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kunaliwafe.pdfIn PDF document text
    • https://intersat.lv/files/file/gibawugavanazaxodut.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/lapisizimebemoku.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/27814971939.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/74262283925.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/33058618834.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/36433842536.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/77442821897.pdfIn PDF document text
    • https://designclarf.it/file/83127357983.pdfIn PDF document text
    • http://kvrhousing.com/uploads/39209459572.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/zuridisomafuj.pdfIn PDF document text
    • http://citra.cl/userfiles/file/tagagimagumogidopexoli.pdfIn PDF document text
    • http://medi-sen.com/files/files/10559170128.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/24244565322.pdfIn PDF document text
    • http://sciattella.net/images/file/fudopelujot.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/23e52a478432a0f8d33cefa79e01016d/dipogexeji.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/7567268319.pdfIn PDF document text
    • http://erdbau-rauch.at/49456627435.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/72197833693.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/92166057758.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/zonubolinafaravewovuku.pdfIn PDF document text
    • https://ckmandarin.com/uploads/68971989571.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365460bf519---45185687343.pdfIn PDF document text
    • https://istanajp.net/contents/files/16663841861.pdfIn PDF document text
    • 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_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 10600 bytes
SHA-256: 678bc5af28620275fbe21bbe455e06c7afe01f90600dbb559e8b6cafb0e5f8d2
font_01_sfnt_off00011919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11919 18340 bytes
SHA-256: 87d3d815494a2dc6bb7de06b0a21b32648ebbea7446e5ece3fe6f009bf2ace29
font_02_sfnt_off000149b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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