Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ed806150f388c4…

MALICIOUS

PDF

134.4 KB Created: 2021-06-16 22:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 553aca1543fafdc24e2292f61f310011 SHA-1: 003523a135004da6e6fdc7ce47c73e556af69bc8 SHA-256: a0ed806150f388c4ba2d4adca3681e3681cb110beae3cd40266acf881607862c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixomot.ru/uplcv?utm_term=sherlock+season+3+subtitles PDF link annotation
    • https://mytalk7.com/_UploadFile/Images/file/mumoro.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/0e04a293f3f65ac272ef5590e4c8ae4b/vabef.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d45e0491d---wowizezuvekajegumafo.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/xotirujajumet.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/21b6c68c8feea2a1f08263a74b27b0fd/xivolezal.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/55it9md1nfm0bu1h8hdm957s75/mosenodoxogimemere.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bb5c92b0e---nenukudawototukojifabuw.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/xumoxa.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/02ec6748ff37cfa6ae7c3aa8c03b9cae/89421731182.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5f0b695eb---zilolewalilizuwa.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/50134018369.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606efde716982---47012162224.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/xapel.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/440d24c647064df31702af0bae649610/79098285004.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5da0e0fa9---19143462275.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn 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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0001d7ce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1D7CE 29388 bytes
SHA-256: 05a7930026d4e4ca734af96b092ea62b8a9c02f0d8f1ba200238c4b2b08b8c1b
font_00_sfnt_off000161ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161ED 5356 bytes
SHA-256: e50eb7f9cb063b896b3687052232a526300a98b16357f6ac70e58f333905a304
font_01_sfnt_off00017417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17417 10012 bytes
SHA-256: 01a25957e62e55f21a5cc09bbdc7d95688e37426753656613127ccd4a19fe3f2
font_02_sfnt_off000191f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191F7 6200 bytes
SHA-256: 0e910029c8016e1dae5cc8d0bc904d5bc6056f365bb2ed649884b373080232e6
font_03_sfnt_off0001a763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A763 16808 bytes
SHA-256: e5977bd29f001f7b0f5668895a1444c339476ff6473ddf4775706f8340bb824b

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