Malicious PDF — malware analysis report

Static analysis result for SHA-256 b544e782e0e5a12d…

MALICIOUS

PDF

90.4 KB Created: 2021-09-15 23:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fa114a8c2531a1a74c03859df7d4d7be SHA-1: 382f89b02dc8ffcde7f1f0d2367a75008a4434b2 SHA-256: b544e782e0e5a12d576c3475f4b11bf57bc20c8b1c81229765e60b995a0e87eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and presents itself as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The primary purpose appears to be directing users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rosritual.su/app/webroot/js/ckfinder/userfiles/files/96792401811.pdf In PDF document text
    • http://skiflogistics.ru/userfiles/file/komumo.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d6a92e0cc---1434864660.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/6970551791.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/79752796395.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/092151039619.pdfIn PDF document text
    • http://aurora-c.jp/files/files/41118818604.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/28021818712.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fec832d1e9---lexusejamilavaxo.pdfIn PDF document text
    • https://ckmandarin.com/uploads/fuxum.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/14912575031.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/zaxoxopadujojajinuxegevib.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/vusat.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/nazebobexase.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/34402966837.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/silonisibazarafuxuniji.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/2a326bb0a2032e6186d073da715e2d8d/14010424231.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/24483801976.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/fafajobijovum.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/5545735895.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///rajapiran.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614245e515316---mimekolovetiwulexa.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/luterip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=health+app+in+redmi+note+9PDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/31890287488.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 21244 bytes
SHA-256: 6052ef6f981718b8d9a1251324dbaebc384542d26d9f1f0b4da3506610ee8692
font_01_sfnt_off0001156c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D83 10648 bytes
SHA-256: 4481d01fc85ba53b2e363591dd7dbe9bc63ff4aa54fb47ba0b370a9f8d0e2571
font_03_sfnt_off00014591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14591 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f

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