Malicious PDF — malware analysis report

Static analysis result for SHA-256 710e1a7be159e28c…

MALICIOUS

PDF

83.3 KB Created: 2021-08-25 15:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2b0fa140a6290303981e548c60382cfd SHA-1: 2a937ac481da9e0e8759d4b59613c114094789f3 SHA-256: 710e1a7be159e28c206bc86e94cfbfd1a54bde1f11e0f15f0e36c5da49a3d30d
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs point to a common tactic of using link farms to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://geombiagioschettino.eu/userfiles/files/28590739791.pdf In PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/pjhrcq9cmq5kt1supshj8nspk7/5566728093.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/59600022204.pdfIn PDF document text
    • http://vo23.ru/upload/file/tibenom.pdfIn PDF document text
    • http://asztromiskolc.hu/ckfinder/userfiles/files/fakawokas.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/v8cgbb6op2uoruh0a78qm6v1gi/23462076847.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c321cccbec7---veketelidagegowaj.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34715024665.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/81890773873.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b31eaf921---tariso.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/2424176597.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1371b19bc0---zoxigotapozopirimu.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/xesewokimineranebadene.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85bcf606a0---53788520417.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/b670cb1b07565e264c48f2e36da4e80c/zapetowuvupupafugazobafaz.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9217775733.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3596728be---31652022555.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/padutiweno.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/gubamuzore.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3d8472a6b59b701e7a12a9d7d88165f4/23678415865.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/77619544058.pdfIn PDF document text
    • http://teraval.cz/res/file/23139970974.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c90359545---fuselozinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=class+7+revision+papers+pdf+with+answersPDF 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_off0000e01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01D 10828 bytes
SHA-256: f3e4d8813e40e84e98a33cbd57d88486636111d0caadb7e4bc73308d7e217294
font_01_sfnt_off0000f925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF925 17396 bytes
SHA-256: 734b608a75aa6cf2b91a40f98326a9054ae3abf118451781d7171920895e9995
font_02_sfnt_off000126ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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