Malicious PDF — malware analysis report

Static analysis result for SHA-256 08fc53c93c625b18…

MALICIOUS

PDF

95.4 KB Created: 2021-08-07 02:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4eb98aae743a75a8229c38515a1799b2 SHA-1: 2e30f6c940a9fe82435e5f5b108de7b5a72172cf SHA-256: 08fc53c93c625b184919bddf8ad32c4c9a3350d2009a143b0d516ecc20904253
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites, many of which are part of link farms. These elements strongly suggest an attempt to lure users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=example+procedure+text+how+to+operate+something PDF link annotation
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/53qunhkicqrpj7lt2ihk3vhqaf/kunijutirarifivomazi.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb40f9bc8b---kewagubalakupim.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e2f3c6be66b232eb231c3fc5fd6d8001/feliditalami.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/jilokizokutakikojig.pdfIn PDF document text
    • https://x-software.cz/data/file/27249645834.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/93491855823.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2b0b75773---36131823085.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/tojonufodojekunujuvowis.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/dorejanefep.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/594sbueaeu3ojv2ktgd0kfo5kj/bomed.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/38645263749.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e6e1227e37adab4ad2e0abf7434dca2/83812711746.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/431463901.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/mijuzevugeloga.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e83eabb91---gasozoligim.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/40829715668.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/nimidupuzeb.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/8a96rlbsg8h6r3f21orn5q13cm/51603799188.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c6e7966bb---jetodozutokira.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/ritubekolizakowuwiguruze.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/poleliberetodunesipeg.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ohgp46aqkj3hl4bmab4o9am742/89617646537.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/18047056031.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/07d1f2c9de9239768243df6a1ee1900e/sujitu.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_off000112c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 16164 bytes
SHA-256: 8b34d182ed28833bf4b25b6211bfd43eedfe3ce20bbe1bf20442a50ca0a90eb0
font_01_sfnt_off00013c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C84 11232 bytes
SHA-256: c7424cffc64adb04a417856bc71db0c198179550f8cc874c5740540b8daf2819
font_02_sfnt_off0001567f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1567F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1