Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18c66f00bcbae41…

MALICIOUS

PDF

81.3 KB Created: 2021-09-23 07:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2de5f1527c378a5acc0bfadb72259a81 SHA-1: 20457b3ccd7a952df870ee109fe673ad34c8400e SHA-256: d18c66f00bcbae416cc45bb8faef244bc2be66af0ed2099180d9bf3f6e851536
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content. The presence of a visual download button lure further supports a phishing or malware distribution scheme. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=6tv+apk+new+version PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141afd186e81---88921914460.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/motibalamab.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/24040459564.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/juguwepokek.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/tusuzosariwekotor.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/vemabuzaxijuretutipazaf.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/7115544520.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/66590816820.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613f480971826---xofijetudiwoxewomiv.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/rusonesetagedogovupi.pdfIn PDF document text
    • http://steinemann-ag.ru/9993587041.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/jisuwum.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/xuvilexafimuluxilibulawup.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/zoxowapazulijanazik.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f3d2e9b4---87924005023.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/75219082571.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/zoxamujetafuvawuxar.pdfIn PDF document text
    • http://farashimirooz.com/files/15355321656.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/83162960650.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fe7878b7a720715f71625966be522b7f/26191725290.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///bitixipafufifam.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/pesitupuj.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/64691611591.pdfIn PDF document text
    • https://bnovum.hu/downloads/5514690681.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/88387630799.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/ninovova.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_off0000d70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70D 18664 bytes
SHA-256: 885c0dd519c48ae4994236b9a85f340093032aa5f14ab623ce1e5908a013b83f
font_01_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 10512 bytes
SHA-256: e335da6db9aab15ce493221326b67d3693e7b404352bb401df3213877e837576

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