Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f666aa9caa431c0…

MALICIOUS

PDF

89.0 KB Created: 2021-07-04 20:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c35c3790d5f46afb9be5e013dd0e37ab SHA-1: 4a6058385a24d53ae408960a31bd937b4e5f5b84 SHA-256: 4f666aa9caa431c09a9e6d3087349569c2c2db764c6cd3ea338730da82401306
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=full+electron+configuration+for+potassium PDF link annotation
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf80570abc---17664347742.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/96542760866.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/18903633669.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb98e97f7ed---xulim.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/fcjmg7567ufkg8ocuisotmjsha/81842413698.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/b9f0c56ed539f28e587cb88ffdfb4054/pozitiserureb.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/gipikuxi.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/kajaduvilepelopav.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/goripupedemopakilad.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/jonevasubumeri.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cecab81f0---ruwokenuxumo.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/334011bfafbe13fedffb8b6e7e114fce/53107610729.pdfIn PDF document text
    • http://dzbnf.com/upload/file///jukoruperogujovagijuzomi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cr29o50uhlj1kjqaldj5i4reb0/gapafedokafif.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160becb1d02f81---dudowamaziloxe.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609d43f4197ba---defixurikejuv.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d763ddb608445e66813fdf9c61ef91c0/63143859844.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/aacd14a365315be66173c2e56da3bb05/13089115024.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/p8l4i7ojmde097kdnhso7hv641/43106671384.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/vibutama.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/demisokubekiwefugi.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/bumezojadakojekemuvuvida.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/385a6e721acccd3e83bebd5b73a65bd1/gikagilobutidezut.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/fazurogukigor.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac511e947c---watibus.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_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 17052 bytes
SHA-256: d49ba3fbb71cafe79f2d0cd52afb2b99bd1d6c4d7ba74745b5a514ab699806fc
font_02_sfnt_off00013d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D40 10900 bytes
SHA-256: 6ec6a2356c74188270f4b33d5b25eb1e286e038bde849bd9291bfddab929819b

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