Malicious PDF — malware analysis report

Static analysis result for SHA-256 531a2dd26667ae38…

MALICIOUS

PDF

95.1 KB Created: 2021-07-07 00:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d9d5297e2348933296955b86539a9d9 SHA-1: 9d200bc5aaa158dec5c89922c679c25baaf7e4d0 SHA-256: 531a2dd26667ae38647b296e5cbc76638eb3710fabd8145bee875d8ba26c8b98
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs indicates a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/9fc445bfd5328959ea8909d64a71638e/pusesiduwok.pdf
    • http://littlepearlspublishing.in/data/eimages/file/sunobatigulefuzezesu.pdf
    • https://ringid.vn/ckfinder/userfiles/files/53634379100.pdf
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/98480356434.pdf
    • http://agro-vostok.ru/userfiles/file/99070683992.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7ad7c84fbe11fececf6b0534f150893e/zukese.pdf
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/25334868101.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ca42ba1510daa476470a5b6cf20711ed/xitogunopudavexakamofur.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e33a3cd5f8---52374897280.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3998ae4e4---bijivezema.pdf
    • http://eot.mn/uploads/userfiles/files/muxod.pdf
    • http://ladyvenus.it/userfiles/files/xekoxegenutazeratovomi.pdf
    • https://suativisamsungtaihanoi.net/upload/files/99394554940.pdf
    • http://af.ssla.ru/images/fornews/files/vunuvexagofu.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/pg0urp3niol82m9agdma34gvj0/70258369162.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609182488110a---81035019647.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f4288f58ea6f60e5451edc2b605046c2/72565060903.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/47c8e0635d66d764d7086fca885b605e/50310423336.pdf
    • https://contabil-fiscal.ro/mm/file/jezopofenatitetegapabezo.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4cc8d3c7e---zuxuminuzogisavabiroliga.pdf
    • https://jackyrouxmethode.com/userfiles/file/16210107661.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a613800fb9d---gitasolatavazetamutowi.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/c3ee3d2b505a3cd3dd22d1b1bd85a88c/73813767301.pdf
    • http://c-amc.com/upload/files/22472838292.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/01cb95f7c46da643b276c700d02f0e62/6222848253.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+kursaal+flyers+little+does+she+know
    • 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_off0000f943.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 16792 bytes
font_01_sfnt_off00011154.bin
86ce0f15627d95261762e2302b174ca16fd7dfefa05089870d58c1f8c5dcf3b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 16476 bytes
font_02_sfnt_off00012735.bin
2e3f1bc3876b14d719ea5e705212c484095054d9a7abfd349ef8287e363411d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 10804 bytes
font_03_sfnt_off00014027.bin
7bc9b12640dd23b393ea413b79c5340835a6d247c405b49f645a83602ad456b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x14027 17136 bytes