Malicious PDF — malware analysis report

Static analysis result for SHA-256 8416baba60aec2c9…

MALICIOUS

PDF

74.6 KB Created: 2021-09-24 00:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a2720c7fd2d97bbf438925e80342eb7f SHA-1: 43fc2f20c60eb759bd97bdeb3eb7258e2ee99d69 SHA-256: 8416baba60aec2c988aa9a48859180df055ee36cf07d97f751db46add3f8c134
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing unwanted software. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=lulubox+apk+download+pc PDF link annotation
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/4f4aa4a02b6fdc930e6598d708840470/48533825557.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/7306502853.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/58156908522.pdfIn PDF document text
    • http://runhouchem.com/upload/files/16798704107.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/wesolewo.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/46862155445.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/10729302852.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/30144853032.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/441e9723d83610c1c421ade02a03ecbe/zatumovikukatoj.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/20097736220.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/12331173558.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/gixosufareli.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/rufudikuzevogadinemabubad.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/7129089815.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/lisajudinunad.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3cc018c1e66d9f96ce0ddb76f06babe5/niwinibekevopuv.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/xuxuguvutonexuzu.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/72531347048.pdfIn PDF document text
    • http://koala-al.com/d/files/49865178699.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/fkloa6n6f5o5a2le8re87nhp5h/sutugubo.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///59564222072.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/42882419565.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/favaku.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/wilunazagezejubufuvoma.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_off0000be7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7D 18104 bytes
SHA-256: fb1908964563f48a0028bf399d1eab3be916bb0293e18deff8e699ad9d18c120
font_01_sfnt_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 10392 bytes
SHA-256: 5d0f53433b803708074629fc48270725e0266eaf2a847a494c7fe2aa2183aa27
font_02_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1