Malicious PDF — malware analysis report

Static analysis result for SHA-256 e80043bf632dd099…

MALICIOUS

PDF

103.9 KB Created: 2021-09-03 01:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c7a5b5286e5698bb1d7aa623f4cf07a SHA-1: 27c7d9c5a41129f847b7b2dcc3ff565f3981630a SHA-256: e80043bf632dd099d113135930997829db2da68f1831b9f4989fa5bd9a46fa19
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://auf.vn/wp-content/plugins/super-forms/uploads/php/files/acppe1cunvf26s6tkhvqc4erl5/84147190747.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f3f0612f40---zizisejasatanagexorixajas.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/xoraxorodubofezage.pdf
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nigibomoxutasa.pdf
    • http://www.aadhar-interior.com/userfiles/file/62981107532.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/b3d089ou0t6u0at8moncoiv0b0/16517805269.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/7a6d5ab1eee7eb8676480d5a1cd5dec5/xujefomisowonuworumufewuj.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19cc113ba9---nudizujabaketosipagakigur.pdf
    • http://abogarestudio.com/userfiles/file/93666660381.pdf
    • https://pasarantogeldua.com/contents//files/jaxer.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c37760dfbf---67647947515.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/lovedajesadurujizum.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/51607862920.pdf
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/wokuj.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3d70c722e---jadeteluxopojojifaxale.pdf
    • http://zaun-produzent.de/userfiles/file/gakizo.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da30dbee02---23026932363.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608b01361052f---82194278520.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4066366c9---58424032370.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f6fcca08dd34d54d74a9186752f48d48/digatosovedudubijapipasog.pdf
    • http://chokmanee.com/userfiles/file/7029371812.pdf
    • http://xsjsbzrw.com/uploads/files/rikelo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610105b63041b---xivewuvodejib.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609886fa0ea56---rulubagasaropapu.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/vutabufibuzapov.pdf
    • http://weiken-rc.com/upload/files/kasumatupiwokabigisum.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4bbfb8d2838d1f831ca52b1b19500601/zifovo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=kundalini+yoga+teacher+training+manual+pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e8c.bin
fe07dc2157926669ec6cda921148df1a18be1a60b31c04204fed5738c291254f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8C 18616 bytes
font_01_sfnt_off00015f3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F3A 16792 bytes
font_02_sfnt_off00017751.bin
07ec34a8d4fe8b7363d7d6083d2651382257ceb743f36d35134acbcbed7cceed
pdf-font-stream PDF embedded font (sfnt) at offset 0x17751 11104 bytes