Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec6cda6b2696b53…

MALICIOUS

PDF

93.8 KB Created: 2021-07-22 21:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3ec5e1363219e0217ffd75ca67602b18 SHA-1: cf48b55881f14922e579fb6934f1ebea23a1a650 SHA-256: 3ec6cda6b2696b53266fbb27cd9a35ead8391a73d43e8dc7e7f7c727087f5876
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6964f585a3---55877839256.pdf In PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087aeb5dd35d---86510713508.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce56842e4b---nupazozamexo.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/86099462089.pdfIn PDF document text
    • http://diodelumi.com/ckfinder/userfiles/files/43349123472.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a3578d2e423c9d8efc000571026b5ebb/topuverekilosoxo.pdfIn PDF document text
    • http://atya.eu/files/file/venetukajuremudagewur.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c633142c1c77978f5dae6791941b04b0/88116338362.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/28e00d7f94dbe389b0d3cd34ad8f9073/kigetabizuburumik.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/tizetokofefunuguzadufut.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b987a20fb8---mabakifore.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c7b5369c5b637dc37713eaf6bf4274f0/mesorejigebe.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/32f657ea589538f619e712d101111e38/lowupifufuxugobeg.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/wowoge.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/h39bihsugba16hfluu3hijkkn4/46243518954.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/ragasekavitatakakuwu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160729ea259e7e---sosonazuxuxukepe.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/899969807.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/41fbf1399c6ff2e170ae66fb440b5e3a/dekalabenapitibogotoj.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/xonuvodud.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/monirikip.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/35970778170.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/pivoxitelak.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b345a50101---17165653790.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/60502537982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=wow+classic+shaman+professionsPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 10724 bytes
SHA-256: 72ae94636a84f0515b7561c3794c0238af59019c573801469db41ffc6def8590
font_02_sfnt_off00013c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C98 17156 bytes
SHA-256: 0c47d3cfc36c51e9595190d316c7cf0b5ed4d7fa745ea5aec86b7bb82f91ab82