Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e6e7c431ccd85e…

MALICIOUS

PDF

86.8 KB Created: 2021-06-25 19:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb682325f6fd27d14a6e15042445bb46 SHA-1: 5cffe1ad9228e3fd7baa3337d898d2ffd1b6f93e SHA-256: 13e6e7c431ccd85ef9393a53f6b6fccea85ba5550e6a819f532cdce72d92712c
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous URLs, many pointing to compromised CMS uploads or disposable hosting, indicates a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://extracam.es/app/webroot/arxius/file/57043050591.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/3452ff37945f58ee6c7c9e750cee2d86/gaxewojurodasosuvovinevo.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/82598386635.pdf
    • http://falconartistmanagement.com/ckfinder/userfiles/files/sukezuxezigobatet.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/egk3f943h8kiuud1f5sbg4pr71/11990725929.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/namufupijat.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3d7249ed6---92007632153.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/l22v6cf9ab5uqjodf75ge623v9/21466607471.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/732a5dbde64d647a7c50ac97af84eea4/32483159496.pdf
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/tiguzarimepotazuv.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/625966a28f6a90f33893812f513db5b7/litolovukineturo.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/39779135bfc48218c39e48ea8ead06d0/43677300865.pdf
    • http://massageindex.nl/images/uploads/lobisobunu.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16073ed13b83c2---jezopudekuf.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf0be252b---kusol.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/26ad72e874e1ed80b0aa1af57b393499/pekekanekipametakozezuxil.pdf
    • http://esrafisek.com/images_upload/files/44496765817.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/6k7sjpd7b7tl40rub0h4ngocmd/56405122035.pdf
    • https://guapa2.com/admin/fck/file/67973191284.pdf
    • http://www.aluvascientific.com/UserFiles/file/43026481926.pdf
    • http://aquatherm-graz.at/files/1683937823.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c654c5f0---dagojuxi.pdf
    • http://ventilatoryzlin.cz/images/file/31735412821.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f43e2b98c0---72374418155.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/16477160931.pdf
    • http://singer-island-condos.com/userfiles/files/morapa.pdf
    • https://guapa2.com/admin/fck/file/679731
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+create+an+invite+on+outlook
    • 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_off0000efd2.bin
7d93102321c5ba5bb083682f328cb70f7925ed57678535aeeeb38bbdc0baf36c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 17812 bytes
font_01_sfnt_off00011de3.bin
4682e573df0cd94e6d0e2e20df183282558aa3fe377d29b21512806627875ecc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE3 10392 bytes
font_02_sfnt_off00013580.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13580 16792 bytes