Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf43da348b01da5…

MALICIOUS

PDF

97.7 KB Created: 2021-07-02 17:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3a60f582d0660353f93c9b7df3ae31e SHA-1: ba24554b71a10de0b6d2fb3432d41ff53de3f04f SHA-256: 6bf43da348b01da51b39fa148b2d8b2b6a63a5a1c6a6fa09ea694d0304c07615
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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 https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/20531d8a999b16c176a06371d5772437/wisafobuleluzupomoforipon.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/26b47c495b71de5e1cc633878deb92b3/77446454995.pdf
    • http://anvlaw.com/userfiles/file/55403964266.pdf
    • http://www.contectrade.hu/fckfiles/file/xiwoxoxikedalifowexufuj.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c58bcbf119---10182120564.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf8447e94f---4976081028.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb1a8b8a82---buwepe.pdf
    • https://vgi-vn.vn/app/webroot/img/files/vupotunotus.pdf
    • http://artside.org/data/temp/file/revawukejatezowumuwubum.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72979004c6---xiritugoxupix.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/doosrhofdt7s6vpvq0g6lmb1si/21102482434.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16071a5a81df1a---53739902425.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608300f0e36e1---97652959681.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941d58cd043---32440877923.pdf
    • https://estoniapools.com/contents//files/nokavi.pdf
    • http://lhs1965.com/clients/880801/File/nosiwojad.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/sdd1hd35du6kvtu78oahtulp75/85010376307.pdf
    • http://kochamsushi.pl/UserFiles/file/99183277023.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/e0ebf5091120cc97cc00ca2d17894db9/92547817079.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/cdehigr2h8f67e2lip09v32ha7/22658815594.pdf
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/xufejefegavadazoguxa.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/68882a69d4a742f25ca515ad84c3b2af/gigofurimajuw.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160becb6fda76a---39016092753.pdf
    • http://bukhatirhomes.com/userfiles/file/duxixulilopugu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hot+and+sour+soup+dried+lily+flower
    • 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_off0000fa6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 16792 bytes
font_01_sfnt_off00011286.bin
ae4426bc7e24fbea14ba9ef68c72716d7bc5466186245bca69bdf3cbbdf6e286
pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 10784 bytes
font_02_sfnt_off00012b83.bin
65c480401b1cc1c1411a7d3357ecd75573e9ee53ee0d5a38c4e23fcda169a8f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B83 18176 bytes
font_03_sfnt_off00015a05.bin
54589f8bd9f5270e1b8389cba1179a4390c29bd60c84df521d995f8f507faf83
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A05 9072 bytes