Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e98050d8e046b76…

MALICIOUS

PDF

71.1 KB Created: 2021-09-03 06:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aafb8ea272dc454af55b69d0f4779a69 SHA-1: f1f10047f6fe712ccd7065c921f5658b00f9cb3d SHA-256: 3e98050d8e046b76616f6a56b07c2299c0601bd2ffa64d74515bc65887a5f059
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through a malicious attachment to click on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=nanostation+loco+m2+manual+espa%C3%B1ol PDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a9fvblg2c2kjh4800tvomjt3bp/bobibawusaxepa.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/4696517037.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aec64ce1f0---zebiriduxazir.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/nniriombifncjbtrplqrsqnu93/dasekafatasijuxokumav.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a08699280---58899765887.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a5169b12d---33306750898.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/tabipu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bc1de3a4f---90597542544.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/8f59aa7c65acb1cd94f5c84587fcfcc7/62797946918.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16108e6d4a522f---tusuwax.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160cd13bd8a1ac---56442644137.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612b6181c0ec6---lusakefemezizepodano.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/zerire.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/90442674869.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/refer.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/31254015685.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/gosuwonuvilifometufol.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/menonorisusinipepu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac772ca2159---17254195442.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/7e5b96b441a5ec81a32d4f5afc352265/fufef.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021730224184058.pdfIn PDF document text
    • https://artenika.pl/fck/file/24089110797.pdfIn PDF document text
    • http://freeski.hu/freeski/file/16702803564.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090caec63065---14271231394.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/902873a2c69cb6ac8b3acbdee087d4fd/nizitorisowopinoravefep.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_off0000b59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59C 15120 bytes
SHA-256: d03662f8771eca8b99d8a579242294e0c6ddf1361d653137c978792f73f99dbb
font_01_sfnt_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 10836 bytes
SHA-256: 8a47278ba6115997228551b7787deb58a432527d89d3aa814ef143d1e01b73dc

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