Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe27d2f3d5ad99a…

MALICIOUS

PDF

73.8 KB Created: 2021-09-06 09:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a63590d64c8ef6dae10389168afd4469 SHA-1: 13d51b6ef4a8c56098dcb2b6639fa76d3778450e SHA-256: 0fe27d2f3d5ad99a2102d317b442eb86f167cda9566bda4c722e49c8b4dcc119
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/13596727607.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/cm8t4svmu580pdr861t1m63kke/16228623905.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/caa37aad0a8d8367faa7187ffa90a70a/wofavijonofejixufipide.pdf
    • http://www.sm.ac.th/ckfinder/userfiles/files/latigodinuxonaxunujokak.pdf
    • http://sahamit.net/userfiles/file/3299155038.pdf
    • https://cahayaapi1.com/contents//files/43181277178.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/7iquntjc01cs9qs90kfksbekls/22769140629.pdf
    • https://anyimaker.com/upload/users/files/22177949048.pdf
    • http://tarnava.eu/user_images/file/91035126184.pdf
    • https://grandhotelbulgaria.com/userfiles/file/retusenizal.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/2mpmmvb6m2j8otnl18kun2ngd7/70568812657.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/5bfaom5fgq8bdpk4r63fncfnap/62999988022.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65fd7c292---ramefamefaripivemivubam.pdf
    • http://amandatravel.com/userfiles/file/85072479108.pdf
    • https://cjsc.se/ckfinder/userfiles/files/lufekanamokuwedozuliri.pdf
    • https://medtek.vn/storage/file/69106702562.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/zasugubujafere.pdf
    • http://skazka76.ru/pic/userfile/30847795652.pdf
    • https://privatecambodiatour.com/userfiles/file/8649589214.pdf
    • http://srhs1980.com/clients/877094/File/bukitagasirifugagogufumo.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073a20a3c8f7---85179675958.pdf
    • http://www.chatanakonci.cz/userfiles/file/36386940821.pdf
    • http://gonvvama.net/filespath/files/20210812084438.pdf
    • http://teplo76.ru/uploads/file/77768626429.pdf
    • http://hotararicedo.ro/files/files/tojaxe.pdf
    • https://www.nevjegykiraly.hu/userfiles/files/vamog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=philippine+sign+language+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_off0000bee0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE0 16792 bytes
font_01_sfnt_off0000d6f2.bin
06eaeac6f2ea82ca3d42ad5389f837556a8d5eb63d4be060a4e6ee1d17960c8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F2 16636 bytes
font_02_sfnt_off000101a6.bin
b70dc1f2778e3aef25d08093f2e6365c9e05ff9641410ff82cfa37bef2e71a95
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 10560 bytes