Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8b074095fd1d05…

MALICIOUS

PDF

90.5 KB Created: 2021-06-25 21:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2de3e8ca2f467888c70943764eddcec SHA-1: 9c40449e0198b15b7147656d4d5c09f62f3b953a SHA-256: 1f8b074095fd1d05548b4f29724af98a5257b8b97701b3f75175bfa20723a2b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload directories. These links likely serve as lures to phishing sites or malware distribution points. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4051d3047c---76327908634.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d16884e24a---48033816383.pdf
    • http://alkanboya.com/files/file///duvegabinetu.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/e10963d364475c3ef821704e7f80b90a/72816565909.pdf
    • http://www.anjhimayath.com/upload/file/purezejutafupejomaxojud.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b093b6fa13---wijikas.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b29191b605b---3740305109.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/31bbaa33c92f67f1e3a360c69f8ca1f2/vomadixebudoroxatofavivuf.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074682bd3ecb---58555312073.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/7ca5c0963ff82592fc2427866b726d64/pigosetogigo.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/023559cb2d43648115e6d0e01dcebe29/61460637670.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb2c0b910a---65008833134.pdf
    • http://adance0112.com/upfile/editor/file/36802442196.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/45048747930.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2e46963bf08a5f094ffdb3ec98ac9104/67590470773.pdf
    • http://leebyunghun.org/new/upload/board/files/tilikap.pdf
    • http://timeyear-v.com/userfiles/file/zatufoxovevuduxivazeja.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/19235588234.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/40a56fb4f8d1a1f891766377a313ab5d/furimuvorufipisa.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b486492d46a---vavarapekikexinofif.pdf
    • http://charontrade.hu/data/file/59522540697.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/3434884e53ecaf2a101f9a623cf89cf2/jiwidawajezejunozaki.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+boys+female+nudity
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874d7e96bc3---23480871078.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_off0000fead.bin
3ec42c8f5312f8b98b4f12dc1a3cfcea663cb9eaa2fcdde2dce2d0fc850412bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 10836 bytes
font_01_sfnt_off00011781.bin
9fbbea0e3377b9f7b5859602e711218d20cac58802ca3da7c7812e4f751f8ba1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 17356 bytes
font_02_sfnt_off00014515.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14515 16792 bytes