Malicious PDF — malware analysis report

Static analysis result for SHA-256 7760d51c51cb69cc…

MALICIOUS

PDF

83.4 KB Created: 2021-07-06 20:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dede488f5db48dd0599dc200d1e31baf SHA-1: faf53df810738c12b86979654b1ca0be3565ec5c SHA-256: 7760d51c51cb69cc9985639aa64444e3941ec38c59e8160d41e90b51cc24d7ae
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ClamAV and a machine learning classifier. It employs a social engineering tactic by luring the user to install a browser extension or update, a common method for credential theft or malware installation. The document contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://laborke.ru/uplcv?utm_term=aashiqui+2+movie+online+with+english+subtitles
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/c9cab7ff1ce548d6c3b4f7c6e76f12f4/zokutimopejako.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/fiwetivo.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12cb9927d7---sugadafukikaxizamexadalo.pdf
    • https://coonvalleycc.com/userfiles/file/vemifedojamonovebogabo.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b10c368a7---7479235668.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/potam.pdf
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/16675505860.pdf
    • http://alhouti.com/userfiles/file/dadeteluxasavuwifuvinud.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d240067224d---75307980159.pdf
    • http://libertyquad72.fr/userfiles/file/85632957121.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf3eaf3a88---sigaboxapo.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b344f164b0---malelekerijinavid.pdf
    • https://negaratoto.com/contents//files/tamoduretojoke.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/37lts7cf2ppoh8h8l09ohiieuf/5044159233.pdf
    • https://palcev.ru/userfiles/file/78234451091.pdf
    • https://hsse.cl/files/78457937291.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/n21oog9jo6gvvvvge0ugr4nsit/16726151405.pdf
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/98984385226.pdf
    • http://remont-elektro.eu/archiv/file/lifobojukivatejofopali.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609445b12ff4c---32413062178.pdf
    • https://brahmagnanam.org/fck_uploads/file/57040768705.pdf
    • http://china-hold.com/UploadFile/file/20210513021653541.pdf
    • 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_off0000e42e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 16792 bytes
font_01_sfnt_off0000fc45.bin
38a607bd0f5ab2ea83f4582b8f8ed0212af7cb18afe9f50be74fcfd11741c703
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 11096 bytes
font_02_sfnt_off000115cc.bin
16ce762f4005690db1bf177130016d3638f3876ef5e779f2978a3d8bab1cd58a
pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 16316 bytes