Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bce9e61295e91cf…

MALICIOUS

PDF

95.0 KB Created: 2021-06-28 10:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db34bb1bf1277fd5f8840527a66c3d87 SHA-1: 3025813f49ec0ba864b8ed3135798d1738134033 SHA-256: 9bce9e61295e91cf4fd48b0c2828c92b018d7bc9e056513b5ac8be8fc0cc28c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=best+crypto+for+day+trade
    • https://esz.jp/img/editor/files/17635408886.pdf
    • http://shsuorui.com/uploadfiles/fckeditor/20210617/file/16239203023418.pdf
    • http://heibldr.hu/FCKfeltoltott/file/36770823578.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2139bb9a4b21ffb69889a3a0c2dc809e/tezidenujeko.pdf
    • http://hakkabrothers.com/userfiles/file///13824599587.pdf
    • https://roomart.uz/ckfinder/userfiles/files/sujorapavoziv.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4508f3b819---xosasizukubik.pdf
    • http://filtrydokoparek.pl/img/all/zegupub.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2v81o3l6vljs7beu837u9lgr1k/92386952295.pdf
    • http://tensoinox.com/userfiles/files/tinudipikawija.pdf
    • https://habibitours.com/ckfinder/userfiles/files/76379503636.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6ee8652a---91383299047.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cfcff12e8---dajobijowedomemivolubiz.pdf
    • http://21cedu.com/pds/userfiles/files/tokepelira.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16087261575ba5---miwoxusepo.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a118f8b3726---mawijujiwapero.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756f3465335---48279448261.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a287414c5d7---94073250667.pdf
    • http://aep-tc.com/cache/fck_files/file/tekaretaxal.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf90de846b5---78067645414.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9bfef0d73---womozuxokofuwijupejisimi.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16092e58e70a2f---29628841800.pdf
    • http://aquatrustfina.com/userfiles/file/39922444479.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f43.bin
83d59f7f1d036e314dac9a176c985ddfe36f39fc8f30acbd6b5b4cecf00f62e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 17452 bytes
font_01_sfnt_off00013d0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0F 16792 bytes
font_02_sfnt_off00015526.bin
f09c9ad8f59e05dfc5303fda33a4da2c8422b3c49a93cfc71eafca8c81f5ca93
pdf-font-stream PDF embedded font (sfnt) at offset 0x15526 10540 bytes