Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b8739b39f366eb…

MALICIOUS

PDF

101.8 KB Created: 2021-06-28 14:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae0e43ab1ddd39165a84b2a6b4840e53 SHA-1: ca9da9774dddf55576520903f27dfdd7ca27fdf3 SHA-256: c7b8739b39f366eb470e46e395f3e828acec2b2a75aadf8c6b5d8f5933150ecd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/lamelawidazewoxanajegat.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/miladesewof.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092ad1240105---zalorapetipe.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6db96f4c23f10f205bde52c9ba6f6871/51089966041.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e13f14218a---41059005768.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kulemidoboga.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/gaxisibig.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6a402857---75898023392.pdf
    • http://ztkammer.at/uploads/file/mofusavogimatowivuwefur.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed8d6220df3055e54e0a1c1ae46392c6/mivepazajiruma.pdf
    • http://ridendo.cz/files/file/suxavonob.pdf
    • http://sosnovgeo.ru/userfiles/file/sinegaviwirimokuluni.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cqoale6qqh3shpm8hrpq0g2g97/dawel.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921a81257f8---zuxazesolusagotituteg.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/wolurekabewofelanezo.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d633836f01e7092d772a9f8f01ea41bc/gudotobetojopezowazagapan.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5df5ddb13---27267439490.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6f35ebb2dc36b6506c705fa6c41caeed/27396684779.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd57237fdd---watajozi.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/tfj0dq6q3j8avq9r8jk2dmhpn4/60408228962.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/647952223820469e2eb99a1abca5d151/minijufokuk.pdf
    • https://tepihtrava.rs//files/rimuxozugiruzexidu.pdf
    • http://ahkjt.com/upfile/file/rijuvolewonasopewawo.pdf
    • https://hyosungulf.com/uploads/file/gugonikefa.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/bdnhplmh4gjr5gslgc64prrv77/fuwarom.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mike+lazarus+musky
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011282.bin
cc36be21c78edc552e29eb4ff5076f935106f3bff04ae0873b57fd6c7097849d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11282 10308 bytes
font_01_sfnt_off000129c1.bin
a84ac84fe7443695b24a074e64b487acc1da107b352b2c4d7c13869256b91ee2
pdf-font-stream PDF embedded font (sfnt) at offset 0x129C1 18352 bytes
font_02_sfnt_off00015a6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A6D 16792 bytes
font_03_sfnt_off0001727e.bin
66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27
pdf-font-stream PDF embedded font (sfnt) at offset 0x1727E 16544 bytes