Malicious PDF — malware analysis report

Static analysis result for SHA-256 461ccc60402a00bf…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 08:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9db8c8fe9a076ff7d63141f693c3fc5 SHA-1: 0060014ef3c6b67da0f9ec855c8755391ee2b0d1 SHA-256: 461ccc60402a00bf5123f3134b5373124dee626804bc81630a89bf44290cfdb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files, many hosted on domains flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the structure suggests a malicious link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://archism.ru/uplcv?utm_term=principles+of+financial+accounting+pdf PDF link annotation
    • https://tradingphrases.com/userfiles/files/xiranotojuzab.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/zipisufovedizejofufopifi.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/ramazaligixalozigiketodod.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/jorike.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/gefixaxomadiwujitu.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/39790786377.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/33788531581.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/vizosi.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-6/20210906160152875375.pdfIn PDF document text
    • http://baove247.org/upload/files/13140468161.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/58175456907.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/deviduvapasat.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/18569137838.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f78daafbb4---bivujibumuzugesapujule.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/muvebuzegivabulinimetek.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed1c39ba17---demaxadejofuzox.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/kejejomogulaluj.pdfIn PDF document text
    • https://micsys.in/userfiles/file/zuxabirojen.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109052114436653.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/mititojumakuj.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/jokepuxavujekososativi.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/97550053451.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/17806703707.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/2013735093.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/puxovafaneso.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e63506d344---38750372225.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 17676 bytes
SHA-256: 3fe6e8ce73dfffcf905dc0c305e4b7b5d23835f5d64af2e933e48486e5edad18
font_01_sfnt_off00010d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 10896 bytes
SHA-256: cfe868f3281fbe4997bf4bbfa547642b95ec4a5a6f0b473a5134e0ad0d8dc913
font_02_sfnt_off00012688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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