Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff82e4c352c23461…

MALICIOUS

PDF

406.1 KB Created: 2021-08-08 21:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ce4201286fdaf86aad70d755f615d0d9 SHA-1: 8724aaf8374a57f8d2f50fcab265564f1079dcff SHA-256: ff82e4c352c234617970a050af8cdf31b3739ac4c5f95e07717c237823c9e1e7
166 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as a phishing trojan and exhibits characteristics of a social engineering lure, specifically prompting the user to install a browser extension or update. Multiple external URLs were found, many pointing to compromised WordPress sites, suggesting a distribution network for malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9131

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://oniceh.ru/uplcv?utm_term=fundamentals+of+human+neuropsychology+7th+edition+ebook PDF link annotation
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/5ge5v67r8fm9jfkflgvchl7fdi/80428295147.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/wudasifoxutojafemuluniniv.pdfIn PDF document text
    • https://roc.mn/uploads/files/zakova.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/o5vo0ki52lb1622mbgvlci27ma/65375088632.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/loxudejopur.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/944400bf619f60e739050b0f5c38f24f/84844301748.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/fenadenubuvadawag.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/9214465615.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/tulaguliraxevezowuga.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ece6e2f3a---zoriwugisofuleralin.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/mvvsv3ajsul8asr5aj6jf0ibr7/sojit.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/61854098500.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fe00e0d671a---wajisadaxutogijaxulozen.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd550736ec8---16715472784.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210628041026596.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/tedaworivonemaxoseg.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/21698281369.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d72ae55cd---82027723088.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/47240891804.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c976ceadbc5---70957098696.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/surunigali.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608413a109c05---lufelimaribotu.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/90144450995.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/zosoxosotonozivuw.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/70623102996.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0005e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0005fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE2B 11540 bytes
SHA-256: 5c2c1833513c5daecce2c657774355e877d08e4f1b0025f7a9ad7997deca9ed3
font_02_sfnt_off000618fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x618FC 18344 bytes
SHA-256: beaa2ee9456dc42c4748b86c3cda599462b340e68f030b3395618c0d6ec74746

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