Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7aad6cf9d5dfe41…

MALICIOUS

PDF

98.3 KB Created: 2021-07-28 08:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 430b07c856e80ec422c9df5c1eeec479 SHA-1: 9b239969b0b5a894dd5ec061345ace05a7f39380 SHA-256: c7aad6cf9d5dfe41d4c7475c04b9d84ed9daf4a21795a298578dccd89d58516e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress uploads and disposable hosting sites, suggesting an attempt to distribute further malware or engage in phishing. The presence of multiple PDF files as linked content further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d16ccfb82---vadexobuleliminewu.pdf In PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/11b4c619c6881a7296a1cec243298d1f/botumikesujigin.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/xitiri.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/bozunawagabuwipuzu.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210727094741.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/37891526270.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d93128899f30b7817b6b0c2f29b9ee95/6798665315.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b2c028f84766e39a615e1729f2070793/92656992709.pdfIn PDF document text
    • http://paliukenas.lt/i/File/wabulenobimoxiwakusowuwu.pdfIn PDF document text
    • http://askort.pl/Upload/file/wuzizirinuxumufobugo.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b51c90265ab---dunizaviwupiresonekaviri.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/50593443603.pdfIn PDF document text
    • https://nevisnews.com/userfiles/mexerudajelik.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/12227637678.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/67441268173.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160855d3cc9900---kalumoxadomisako.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1q377c4sk58ii1afoe0b2hvni1/95397102168.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a55968288a7---mapogogatujumepurafakofe.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086a3e2d6854---segilemikesokuwaxu.pdfIn PDF document text
    • http://armanetti.com/images/gipidisufuluwi.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/70m5aa3v9bogr995t2h9kvrgdp/67739607560.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/5sjee4arf1o8ve8vajbf6vdrof/35123817486.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/39884065173.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/bexaneberorule.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/fegonenigolonixisukesokex.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/18108669119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+size+tires+for+2006+honda+odysseyPDF 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_off0001193c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001314e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314E 17516 bytes
SHA-256: 415a276b8859fee93dcd3aaefce56119bd68c5ed3781fc027fe07edb68bc69dd
font_02_sfnt_off00015ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF0 10980 bytes
SHA-256: 9960544221f20100c5737272b10c56fe3bd748ce8c1639668e70f1139ed4c477

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