Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbbcd4c6d80a1f9…

MALICIOUS

PDF

82.6 KB Created: 2021-08-02 03:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4cea39015edf9104c987b8bee9b36bc1 SHA-1: 54febd901559dafd5f9f39c1be36ecf59a7ea389 SHA-256: 1fbbcd4c6d80a1f901b4c6bda161e8a917edfc8cedc62e2b1df7dfe1490d2a46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is flagged as a link farm, indicating an attempt to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The presence of multiple compromised WordPress upload links suggests a tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=gta+5+oyun+indir+club+android PDF link annotation
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160e093769f1ba---loresegosorebavexijusi.pdfIn PDF document text
    • http://strandedtattoo.com/file/luwonavisivusenufolibiro.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/kesuzizit.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610724426f171---jarazud.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/subobikofanewujegudime.pdfIn PDF document text
    • http://lovesenergy.com/file/59822372855.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b97393bcb4---91140348869.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87b298519---6067796306.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/36690920983.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/disob.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083428680a8e---90468267822.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaf3c0ce02---pukawusabeludexe.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5689314960---23896183325.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/99306149300.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0878519548472ec9ab8bced12bf215ab/waderanajawisetejunovan.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/a1fb0620e68deddef81573792333894c/76678232523.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd59fc4c80---raxifefopafofinuruxawon.pdfIn PDF document text
    • http://allycatering.com/userfiles/xowid.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/26525849433.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/12477895637.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094820adea5e---letuvexerejunidimap.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210703020346.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41f297b2b---xopibakifemobuv.pdfIn PDF document text
    • https://stopserv.ru/files/file/zegoninudopiwosizakubi.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/pimovaluzimid.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_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 10592 bytes
SHA-256: e2b14eb4e958efd57fbf79ad9d5522b678b3adc083fb5c1c495dc8ae7adb8fe6
font_01_sfnt_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 18180 bytes
SHA-256: 1bbaf6b4fafb359bb3e5bdf7826c7816453241c00e5728b5c49f3631c983af70
font_02_sfnt_off00012436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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