Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6061d6f6a33c14…

MALICIOUS

PDF

96.9 KB Created: 2021-07-26 11:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b73fce7fed328d72730534620a4b5872 SHA-1: e30792c3eae622d0a35357a091df715a2920e0bc SHA-256: 7d6061d6f6a33c1417de3f3d62a7bae15e3054a83ce8d70ad1dc5cec14e8f39f
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous links, many pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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
  • 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://healthywithhart.com/res/file/ronopipuwasivomukadudukun.pdf In PDF document text
    • https://kiameds.com/images/upload/files/61778985848.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/59843860127.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/58053133054.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160878a9cc2024---55182298172.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/dopizorewatexap.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/nedozokidusi.pdfIn PDF document text
    • http://digifast.cz/userfiles/81513014404.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/4374e142d446c9d0a3cd1a556578eb65/muletitozivaselitojanak.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608624561ce5a---35973011869.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fe8b4b0eb---86866819009.pdfIn PDF document text
    • http://industrialdevices.in/uploads/62580427705.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/73922213219.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/77nl7ogelk4ec58kktoar0m179/xelujojo.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/11500811862.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ipl14i872s158qdapjc3ah7oi4/taxolukidewinob.pdfIn PDF document text
    • http://bjjiffy.com/upload/mikobizarajo.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/16162549595.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/91d305c1be0bfeada216f1e5057c4703/faran.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c54f79a88---kigefufowiwagolukoba.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/12344354833.pdfIn PDF document text
    • https://songhongresort.com/img/files/vepifojureresikoravo.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/tobenegalegutujib.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/jabudiwipe.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/tokusiduwakulotimiletaje.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cb6f26bdc---58204149166.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/ralojotifunakudupisewes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=jillian+michaels+30+day+shred+downloadPDF 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_off00010fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 11020 bytes
SHA-256: 9f5314a9a423c04e73775c8e4f78432406883c2c42a07c840444f0a8cdabc6cd
font_01_sfnt_off00012958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001416a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416A 19372 bytes
SHA-256: b779c3e83ab8e07b5bfe45a40d573876011d28d6960b9e4995c83e539c55cef9