Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4586315c37568f6…

MALICIOUS

PDF

90.6 KB Created: 2021-09-08 08:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: bb0a6dc11433e2e58753280a43325376 SHA-1: 07b82c43c5977c88283b5c928995fa72e9607ea6 SHA-256: f4586315c37568f6bdee9b8c2e797057c2c04f4ee08c0842427daf432c3d8eba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a remote-support lure. 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 0.9913

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/40719508773.pdf In PDF document text
    • http://mamaskitchenorder.com/uploads/files/vejamokapavivizevegezir.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021060219509_991107906.pdfIn PDF document text
    • https://bamor.org/userfiles/file/rulukipojoris.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/cb7bcb84e81e50957e2259d8440619e6/97002718949.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/77796466371.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/lanowa.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/11799990850.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fe009d923---waferivufikinizofag.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab415be2f67---gezojobanozifawikufogeva.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/wiluvibiwodizobitem.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/vajede.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/10649245496.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16077b015443f0---pujonopilos.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/086a7fd57743b51987d8dc5f6fa0011b/49071104742.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/d5060ab24f938f5dab25fb628fca9794/99318811243.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/wukedimomemojuv.pdfIn PDF document text
    • https://rinducm1.com/contents//files/3308589845.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e1d937b56---guvatibobibuleparimala.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/29821278237.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/rbq61m3fidqpso1io9nno4mg9n/48709078485.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/zijirilutedun.pdfIn PDF document text
    • http://jarosi.hu/files/file/17131551498.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/71a584085d30dcf25c4afd1aaaece1e3/kilavisefuwijunoxebozuna.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bf6b97941---96925594434.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085ea9e8bc93---pakumuzedobadojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=arquitectura+de+3+capas+ingenieria+de+software+pdfPDF link annotation
    • 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_off0000fb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 18668 bytes
SHA-256: 7da8f06083f21d2d6ac40a268f2696939b53e935bf5b4e2ecbbe967848bb946c
font_01_sfnt_off000129ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14205 11236 bytes
SHA-256: 10f59b739411b4ce244670109e6962fbee3e6970184f6cfc8c7fae45f10222f5