Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f75860ec5c02e6…

MALICIOUS

PDF

68.9 KB Created: 2021-05-12 21:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40acf11a259531f597d631c352d7757c SHA-1: 62698c2c33ff2d4b17d306317283a0d334d6bb4a SHA-256: 03f75860ec5c02e636407a8143e1444f1f65bb24a6edb5cd47041f1e92aaefd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=alkaline+phosphatase+activity+bone+formation
    • http://rainbowcaterers.in/userfiles/file/pukuzeju.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777946095b4---kunujifogojasa.pdf
    • https://hashtag.school/userfiles/file/magekijitewitodexifaza.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e583b741a5---28553092704.pdf
    • http://vladjurnalist.ru/archive/file/51574393445.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/fda2dd3a0b3a7b4e741d68796abff49c/pebanujajezow.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898a9c55ce5---74767994073.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d82445f79a---nugarawunaguji.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160986b239d073---jugarabagasozegadepo.pdf
    • https://benqmusicworkshop.com/fupload/file/pidaroworavotorizuwive.pdf
    • http://korean-school.hu/hangul/userfiles/file/sefovefenenibo.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a338afa2---bikex.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a693d21b49---besaxewawimuposafutil.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160747506670ee---85768555932.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d04a.bin
e2d72f04d4d7cb7202fb7537ef6031e28e1770f6297f3ca6b2b7090f95195e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD04A 5608 bytes
font_01_sfnt_off0000e341.bin
9d4ff197856a4616896be0030f2386ad76deaae1880795bcd02217768b572ac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 10292 bytes

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