Malicious PDF — malware analysis report

Static analysis result for SHA-256 2147de373e35c514…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 04:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d784d666fa4485bcb10aa0b0ca2f054c SHA-1: c382df32ea816c4e417226f231e8fc10aea2de39 SHA-256: 2147de373e35c514f02d309513d55122753ec6c952e3c9bc53631d707455c0b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to numerous suspicious PDF files hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and a link farm indicates an attempt to redirect users to potentially harmful content.

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 http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5f95dc8d---titonumafipusagivarati.pdf In PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/piforole.pdfIn PDF document text
    • http://proxima-design.cz/files/file/75013053130.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/4544811e635165887108cc7699f8ba04/nifun.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6gdasciehan9c0fcmq8864v587/zurumobi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944f280e294---fasewunodadipumadupexiwal.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/sotujovegimabojod.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6fade6afb79f08c3b1e1c218e6e11021/66051894753.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/zidaxijafi.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/73980167999.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb21d6082---wujamixiwidataxuk.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/73302376178.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fdfd790f9---17129927365.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/80358187145.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/87783d8238d2dc38b30055599d327417/dufosidezitivumibe.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0036e230---40839755808.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/1807ba5638782c23317de2dd0905ae90/51115424040.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a77dc6973---21036342844.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/ronag.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f0ad95d83---89071433591.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/26478965631.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/loruwelegezigibogokel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pdf+downloader+appPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/877a81654d529ffc0950875263c015a4/rusebatawumarobavobigujo.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_off0000c7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 17328 bytes
SHA-256: 75f010ea00921de14f4755d28891bfe6323665537a42eac9606ff5771d270f27
font_02_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 10220 bytes
SHA-256: 3d9fab3a5422d76c40385e3d774b6b3a25b72084ea644eb74f9d6e761c3ea928

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