Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a34a056d21a4b64…

MALICIOUS

PDF

83.8 KB Created: 2021-06-28 15:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a2e29189705f5189f81ca8b5291f3f2 SHA-1: aab07a8c39c056337caca3cdc80c6aa68e393fbf SHA-256: 9a34a056d21a4b643ab729f2c93b025b5fc1cf7a0419dc86b1655d6bd34a8093
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection for a phishing trojan. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content likely attempts to trick users into changing payment details or accessing fraudulent financial instructions. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest a link farm designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://pistant.ru/uplcv?utm_term=10+dollars+in+rubles
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608134ae04920---42428295191.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3ac156fd2---60933030896.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a979d968f8f---dixaxaligemapakur.pdf
    • http://bluecars.pl/userfiles/file/91038113435.pdf
    • http://kleinschaden.expert/userfiles/file/padalapurasamugorapuj.pdf
    • http://progettarecasa.com/userfiles/files/16770591409.pdf
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/50595980507.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da63da20b6---tijuwa.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607573dd7e812---zemozor.pdf
    • http://www.niziointerior.pl/upload/file/nozewebuwenuvakawerab.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a68592dbc54---vewaxutofadozujolebisupar.pdf
    • http://yuha.be/_files/file/67523396953.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddf04499fa---fidonefebusus.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/bed762c87b75bfc8ac8b72a320211e57/vevusasakog.pdf
    • http://360mart.net/uploads/files/25896293719.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c88b4322c13---kipimate.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080f627a7c8b---69659556779.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/55b4ldc7kfqld3vru9tnsd7bfb/gomofavad.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/a168ac0556c5d382bff21a384397c627/rivakowusup.pdf
    • http://drivescuolaguida.it/userfiles/files/nasovuwas.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb2c00ef8c---17271125302.pdf
    • http://csc-028.com/userfiles/file/20210616004522_7vs915.pdf
    • http://ipceurope.com/assets/file/15536646405.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/fejajejegeferipolugoji.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_off0000e6cf.bin
63a3019681a3c61443676ea76857846cf89ff57df9fc9c7ed308f9ba53935328
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 16752 bytes
font_01_sfnt_off00011294.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 16792 bytes
font_02_sfnt_off00012aab.bin
9899e6863ded6e7cb47c2bfce232e2313d2d52d127da957e35c3aaaf5c149185
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAB 10460 bytes