Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e817a68caa9a3fb…

MALICIOUS

PDF

86.3 KB Created: 2021-08-07 12:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35cbefc174de998a9bb3b6df5fb9d89f SHA-1: e18bf0488811cc52a985bfc5d5453abdf9e099bd SHA-256: 7e817a68caa9a3fb059dad90054e46f6c7831cf8154833cc7c2c78c8dd111a56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous external links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to lead users to phishing or malware distribution pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=departamentalizacion+por+numeros+simples+ejemplos PDF link annotation
    • https://anmimar.com/royal/userfiles/file/21878679605.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30cfb9aa3a---niworal.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/e4nks5b4erh31rcqjal9775pd3/mikasomiwukowug.pdfIn PDF document text
    • https://dm288.rs/slicice/file/tesiwidoxomuvebor.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b74a1d5184---19296847872.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/2e0fb0ffe16c7b6445b19ddb00fe5344/gisobojilojofukejizogeb.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/48038481234.pdfIn PDF document text
    • https://elemonbg.com/Files/File/gonexopogafonekijilobo.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/53781576896.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/dawejelupizok.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ac1564168f14b88ea00812f974f6cf2a/39622003220.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/96a8a16cba1115d3475d90d57d45ee19/refuwamufaje.pdfIn PDF document text
    • http://mousike.it/img_ins/files/91980543483.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/98413939743.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/konunewipapekas.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/89216946453.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/aaea5b55000e3d277c04c2cb76656b16/10158525888.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210524044636_yrrw7m.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e6d78e2bd---58926146089.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/97666258123.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/72214651588.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c439a0d07---2562752650.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/kgl8j0sql4vcfoufnrt1442230/38209921610.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_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 10828 bytes
SHA-256: 5de0f3150c67f60146b9f8ddb5c2c4beba7c8f536ae384a7495a19d7f5706770
font_01_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12049 17156 bytes
SHA-256: 65374b9aeff1d191eca6364e31d44bce93709e195f72b11e9527334d460c7c79

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