Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a3c5d51208025c…

MALICIOUS

PDF

93.2 KB Created: 2021-08-13 02:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 51e586078e3f019a6171980bb36a6ab6 SHA-1: 2e52d4be0ac1875c1805ced54fdfa1d52f3dfd94 SHA-256: e0a3c5d51208025cf32277da6fe41bca816216d16ce1bbdf9e75e9ad0483dee5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern. While no scripts were extracted, the structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kfsmttkuf5fu861ut3op3dlvpn/velobaresefijozigo.pdf In PDF document text
    • https://eltechma.com/zdjecia/fck/file/ramonulegi.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/94632057613.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/tomipovoginanujebisunifiv.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/84551699812.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/71849503483.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kijaduzimubizojumive.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/tijeninod.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16098676da79db---1483897776.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077a46ccd4ee---demesifakasakimifoti.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/2cd350210188943c6ad831425a7df441/nenadamogunufogo.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/girikafirat.pdfIn PDF document text
    • http://lulanjina.net/upload/files/zujudapuzujenuf.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/wazerelosurogutiguren.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/77d4633bfab8a1f8eef3dc3ee2024553/kezezagozikutazonazosu.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/fb35e3fb8f86460df105ccdaf12b58ef/piremujazowe.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/kuburaputonemi.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/91626433089.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210801_82F622B03AA8741F.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/90o65drvji4bisijr0vtesftqv/51484033799.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16098403f03662---75553038683.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/67942168d68f844c5efb612e1526be79/43025504769.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb806d6ea2---78742189870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=hemolytic+anemia+pptPDF 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_off000108c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C6 10372 bytes
SHA-256: 7955ebde20e5b33029be93b5eb42583b559e04739ff53a80bcaba312191a1f4d
font_01_sfnt_off00012028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 18640 bytes
SHA-256: dd15834e880e2e613d8cd1755595a638cfc7fb244d73493a01d1f3356c348759
font_02_sfnt_off00014f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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