Malicious PDF — malware analysis report

Static analysis result for SHA-256 255189fb3128b922…

MALICIOUS

PDF

78.2 KB Created: 2021-07-23 03:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 38c2a30906e9dc8fea3b1663be7b4acc SHA-1: 4e014fa866d349d0c33a759e6cbb71bc04ab330c SHA-256: 255189fb3128b922a779c708217738f490cf7c06a0937b7173f3aa886f352390
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised WordPress sites. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef27d0439b---62093088554.pdf In PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/klp87r5au4eic2f34dkiposjgj/63475605061.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608586d68b5e9---rakaz.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/tunemen.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/466fa6720cffac94a4f19206b22e3537/fekimoruk.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/90429837197.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/ec999ca3f2a56bed69f9dabbf2919602/wojilewimepukorikawam.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/daxeparirikojilugefefu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/1d537080012c2b34a436e49b459e4268/zumefu.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/17912340847.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/tufabarosigodu.pdfIn PDF document text
    • https://actorconseil.com/files/file/wujexurir.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/bapadubaguxodubijok.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/pijorixojibesajomibaliwi.pdfIn PDF document text
    • https://angkalaris.com/contents//files/48821187071.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bce39a71086---roputikafufadipifawuraraz.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/41139059706.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/23514602133.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/30064224808.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/72022989791.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-26/20210626162024864575.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210626145309.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/19185279403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+fs+16PDF 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_off0000d1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E6 10112 bytes
SHA-256: 68f8116a70484a1ae8ab16b8cbe6549f273e123edd1760a66dd400ffe5ed1180
font_01_sfnt_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 16584 bytes
SHA-256: ea0749b771747f7b49b026d92db33c5b31a5dbd46fbd5042c0aabcc33067b8bc
font_02_sfnt_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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