Malicious PDF — malware analysis report

Static analysis result for SHA-256 010cb71450354a0d…

MALICIOUS

PDF

95.8 KB Created: 2021-09-19 00:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2361a1372a256348c4d07b4a75134b47 SHA-1: dc92e180500a619633074b13bfe4276799d1dbf1 SHA-256: 010cb71450354a0d8ae06732d236a33dd48af9c2b1c2b04eb84eda9cd31f1a4b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to lead the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=rollback+update+android PDF link annotation
    • http://irths.com/upload_files/files/46649591790.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/51060444702.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/dumibavigunadivuzewotob.pdfPDF link annotation
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/16549520134.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/rafoduku.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/79298340194.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/76352285364.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/kogoxofe.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/sipofe.pdfIn PDF document text
    • https://seerupit.dk/assens/file/90620642729.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/516872162.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091801362673499.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/kiviv.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/pobakalulegemazunuvosufuf.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396aae1b4b4---sapiwanipaj.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b2e434547ccd057f4b15eb080f7f20be/mirixupejotajive.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/kodosikikosejob.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161394cc0b6781---luzipu.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/lukagiripubedokal.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/sitirufovenodiwemiranu.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/98052744400.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614545f87b4f2---74016454506.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_off00011107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 18752 bytes
SHA-256: 1a4e824c25d56ac83745841271fcd15d72022a3d2a14bcd65154e66335ce4cb1
font_02_sfnt_off00015983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15983 10716 bytes
SHA-256: 77c81e9b2e134e0f5ae29b8c1ca36283fdb9a563b6984f23ba5880c811521980

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