Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8266e1d54add9cb…

MALICIOUS

PDF

86.8 KB Created: 2021-06-30 05:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 266a3312658fc079f920192005a8814f SHA-1: 1f5ecd59fdf4fcec291094709547fa75a5f044ab SHA-256: c8266e1d54add9cb683dadd8fbf601a5792a775ce4795b2f5c8ad9346a60178e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. The presence of numerous links, including one pointing to a compromised WordPress upload, suggests an attempt to distribute malware or conduct phishing attacks. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ptairsupply.com/userfiles/file/pikejigut.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/sqdndaaen5hpan5qcldsc3trkb/neduw.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f055b48f1a5bb8b922e574ea418b11fa/49921065582.pdf
    • http://armanetti.com/images/xojozurejaw.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/4037564b5feaa70abd97bd838534ace5/94282543344.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a2e976544---netileribakabuxer.pdf
    • http://stevis.cz/files/file/84805305845.pdf
    • http://homeopathyhongkong.cn/files/11787563427.pdf
    • http://lagostena.it/userfiles/files/dogipug.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a041a4c6578---75487813354.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cdc99a6a9---leporaxakuzikukavofiz.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cc130d1ab2a---zadikedexez.pdf
    • http://aftckwt.com/uploads/file/40105188524.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47d5e5ecbb---52162679885.pdf
    • http://galluccifaibano.it/userfiles/file/zeximiwesezexosasusu.pdf
    • http://chronicles.ae/userfiles/files/34734377129.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/e2e61d69e60988fdc74f5d2160be27d3/mudenevuzipurepufu.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c990ba40c01---towalusivikibabizajodes.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4868bc306---jeweziturigaluretawamujaj.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/3rn1gbl3ukpb9d0sujei2judbs/62719373220.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/97d5539ec5540f74b8cffbd26082ed76/34036573809.pdf
    • http://amirafouad.com/uploaded_files/file/90518927274.pdf
    • http://sebatmakina.com/files/95522011237.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607be144b4af4---tuviwawipawemanezaw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=w3schools+html+quiz+answers+40+questions
    • 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_off0000edaa.bin
7bcbc54f249063d355ed17aba7afe024bf9763d794501486ce1ec8390f0d147a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 11252 bytes
font_01_sfnt_off0001080a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 16792 bytes
font_02_sfnt_off0001201c.bin
e6d3f448d79a53bd2b3a1e87698421fae1274978500eb26f8028de3e23d0f0bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1201C 17500 bytes