Malicious PDF — malware analysis report

Static analysis result for SHA-256 79715765400813ca…

MALICIOUS

PDF

104.2 KB Created: 2021-09-04 12:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f2ce16ee8896241856a0dcc0dc87478 SHA-1: b8c69499ac9792c3bb7e6c34875e64a941a99a22 SHA-256: 79715765400813ca1faa04f43d0192269ec09be4d608af3c1eeeaf54cf01213c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links suggests a tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7545c8d290---wijagetexag.pdf In PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/75953149599.pdfIn PDF document text
    • https://etadelloro.it/images/file/24629608990.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/defawojuju.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b1fcee24d9c8efd06a628f7e3024b416/bivemedizilalewofedajoto.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/k1ijsrv07u1g9o09r0lgfcn933/36779431231.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609652f213679---lesube.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/7512170371.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/14719402477.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/28026668396.pdfIn PDF document text
    • https://ego-sofa.tw/uploads//files/202108061438122563.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b91c7e9de06---dosiwavuges.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e7436c31a---bogelilekelibemamatubimo.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/dirugugusojumoxajuwuwim.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202108220345524537.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/43704712438.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/14509086380.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080624f336dc---71888493357.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d05c38051---98031186481.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/fafutidegiwutafege.pdfIn PDF document text
    • http://jcpingie.be/public/files/28164641427.pdfIn PDF document text
    • http://momsystem.ru/public/file/52658928076.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/38809683789.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/jenadixiputibakak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=goldener+schnitt+kunst+pdfPDF 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_off00012bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB0 10788 bytes
SHA-256: c3e525ba3c9e4bd92dd570fa4ccd921da77fec486213c8fd7112a55965329381
font_01_sfnt_off0001447a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447A 21592 bytes
SHA-256: 9257c22b61526ff48afaf6aac442da15c75da80f8572a9339f8dedd6f8ea1ed0
font_02_sfnt_off00017aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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