Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c2304967d626b8…

MALICIOUS

PDF

78.0 KB Created: 2021-09-06 02:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38a6640cc2217280e53b288e7627643a SHA-1: 95a16c3f289d23a714e97a9ffec232e731052275 SHA-256: 38c2304967d626b8f8e5e78657c6cbd779cb40ee5d6c4773105b58768b802e6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b132dc6e1---jokebokotasasoxuked.pdf In PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba6c3b72e0---ludamaxigava.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/79300037119.pdfIn PDF document text
    • https://intersat.lv/files/file/lakuwegekukidetisozipuli.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16088fcb321050---59665683370.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/32057096994.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764698de314---lagerelubekilufa.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/96057121810.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/11936476279.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cd266c41ac0---pubowovezoti.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aeebbe90c2c---vuxabesopixewonegubev.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995910d5884---31104238678.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/12068930560.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/679a0f43a639592312ce2584b474ce55/6449218078.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/26379562783.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d080a7fe99---nobomojikujeduzifojarata.pdfIn PDF document text
    • http://chromoink.com/updates/file/sivafulipatapen.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8664bb79d---dopubosowevi.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/kiwoxurewerumumavevep.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a79c6b7e7c197018b6abe7cc92e0cab0/voluju.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160afc0d8051b1---48194454592.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/siwugigofedaniw.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/fivifajudofajawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=arithmetic+math+test+pdfPDF 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_off0000cc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC71 17544 bytes
SHA-256: 7b368b64af15f0efb6a27bb985168315044b3fb58c8be797d6ef44090fe59ae4
font_01_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 10596 bytes
SHA-256: d63d23d34478fc4bc08be755a44775bdc74c93baed0027a009dcb0eeee83d187
font_02_sfnt_off00011248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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