Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db4fe83f3adf3cc…

MALICIOUS

PDF

79.7 KB Created: 2021-09-10 10:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 02879b465112e6f6e907e4231fcdebc3 SHA-1: e6e69e1f3d47f7d5f40c64decd581757b4bd647a SHA-256: 8db4fe83f3adf3cce064e138490b2213f67947b96cca1ed189bd7f3e4e4167d4
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites. The primary purpose appears to be directing users to potentially malicious content through a network of compromised or disposable hosting, likely for SEO poisoning or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://sushikyototogo.com/uploads/files/87926804502.pdf In PDF document text
    • http://koreanhotpot.com/uploads/files/xizojusoretagi.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd673f30d---94529542621.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/kuluxanidiluturisasume.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1884660c78b0dd22985deae963d62538/53420679921.pdfIn PDF document text
    • http://network-italia.it/file/859190956.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/javixinuludakisor.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f10b9315e6---rugupinufupixapepobirepu.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/dizowosilejem.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/kukurupimuvo.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ce13d69d4---jixodaru.pdfIn PDF document text
    • https://pecintajp.com/contents/files/42257610779.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16139d12308598---2357230678.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/rogoxejow.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/rogaranijanomik.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/27530296012.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/68054306740.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1359fb8988b1ad456c072eeca5f115a6/54833375945.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130614ac01c3---zoruwafepu.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/38188199267.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210907151821.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/41259585750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=apk+weather+proPDF 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_off0000d28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28C 10100 bytes
SHA-256: 2ee1cc3d06ff555f4fb6b213183f92cba4da4553fe894237752020b0404c9daa
font_01_sfnt_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 18540 bytes
SHA-256: 9c005b7bc5b9eb5ab2422858efa8c856e73e889b117d525909921da45a19dccf

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