Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25e07d57dd21c14…

MALICIOUS

PDF

97.8 KB Created: 2021-06-26 08:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca1534726115d14544d54266b2f16012 SHA-1: 9066510d4b8a35cf1faeaa14ea7934e139316464 SHA-256: b25e07d57dd21c1496a3f8b2125e4945135727f2a77f1b716c5584bd34c1b084
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of multiple external URIs and the overall structure indicate a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://kondicionery-vidnoe.ru/upload_picture/file/bubug.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b33dd8a1f26---16141089405.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/hk592g09brfdbpd29baml500jn/kutumusofapate.pdf
    • http://gloria-eurex.com/78799550511.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/sf3hgug1kn2o9tq2k662i6k93a/85248852049.pdf
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/tetazer.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c86a1f1c4c---2341313348.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/13245269295.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/208c03be2ceeb1323726361f6f45d6a8/22815843681.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a038b4624---26949144168.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764914f1560---49136595489.pdf
    • http://canadanur.com/resimler/files/totorudugudeliz.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dec0f9ff1bb6a8bd4866062406317568/kadefezo.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718de67664f---keduvunelubidofaz.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/4f9b7ddff9f6d5cec9f999a863e74c6e/vefaduzerixoru.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1228276b5cfc8b88451b5c780c7f3015/zawizut.pdf
    • https://namratalakhotia.com/userfiles/files/funalavikalabe.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082adf817b1c---wetipumajem.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gjphc54ld44v18d02r0f7bcp1m/42934660458.pdf
    • https://alice-immo.com/userfiles/file/24087342129.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/91dbe8aa949a5fc2974e4e4f4facb43c/58301444668.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f8ccbe1a4f6331cbd7a9a89d6e67f74f/36125343884.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/zilirosidona.pdf
    • http://cephedanismani.com/images/pages/file/23475648397.pdf
    • http://taiwanglassgroup.cn/userfiles/file/63573015393.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/58071b9c760c81213eaaf34a3d54763f/36937330585.pdf
    • http://dragonera.cn/admin/userfiles/file/5658942541.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=classical+belly+dance
    • 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_off00011d01.bin
09929280483932e76db38e1a0b065389f70adacc628b100583544c20a2654f3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D01 17388 bytes
font_01_sfnt_off00014a64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A64 16792 bytes
font_02_sfnt_off0001627b.bin
ace2a16bd982421becbfa7b25cbdcd2107981f2bc8003f950904bd97b0f992b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1627B 10328 bytes

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