Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b67510456f920c6…

MALICIOUS

PDF

86.5 KB Created: 2021-07-03 18:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64656ab71341b505319cbce4bdfe04a2 SHA-1: 3d0e71eba7a6a1f9f05fce1d7b2895c0e607c444 SHA-256: 4b67510456f920c632fc4110de0c6c816f9f1cdd14fca70d62e66fe6ebe3fe5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Multiple heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a large number of distinct hosts further supports this. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly suggest it's designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://allytemp.ru/uplcv?utm_term=foods+for+pmdd
    • http://yuanjen.com/ckfinder/userfiles/files/15158398114.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ad0040f92---29877319976.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dq1r4kkvkaj0oraepmjp6f2pgc/55185941129.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/5612348d66b65fdf83c2a0d496d76713/mozivirowidep.pdf
    • http://s2ipower.com/survey/userfiles/files/luwozoxomarumorafaxuba.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/capd9aj3mikolo4sq1j3ie0if1/pewosogugazireletoke.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608184e629dae---lujizajesigerok.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607de103e3947---74805363500.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22b71a4c4c---nifumefiwij.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d89d6b8449b---2167341990.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608239f862172---balupof.pdf
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/dulipupuwadilejazezed.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/fe89bc57d0dc41b2560a0e485c3426ff/62639628239.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/71552945359.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e9378d0e1---92196937933.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c858597bbed---98514525949.pdf
    • http://baigeleather.com/userfiles/file/35928483380.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/4628dd07367eec9325add8857e7ee7c0/69229855976.pdf
    • http://arnold-sitter.com/CKEdit/upload/files/32401468181.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/af432aee79799b635d0c979830ae6337/80702270587.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bba994b67ca---kaxedijegedi.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee27f1b60e---bijevavagibufezafujun.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_off0000f4ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 16792 bytes
font_01_sfnt_off00010ccc.bin
01774fbe7b5a9d2b00f1246e1a2461f147b76e9d10762dd04742659e6ccc95ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCC 16304 bytes
font_02_sfnt_off000136fa.bin
ffb8ec46d912dad6936b44346b1b303ee9a7a5e07002860a3f4787767106ab98
pdf-font-stream PDF embedded font (sfnt) at offset 0x136FA 10004 bytes