Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ce4a5efd382046…

MALICIOUS

PDF

76.9 KB Created: 2021-07-01 09:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14f3b29ddaeb3a29feaec4fd4623dc15 SHA-1: 4baacfd1c9c83731a74d0100d528b85b31b74b5a SHA-256: 78ce4a5efd382046e5f39b5d02c71234931a68c9489a545660e02882a54ed1fb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://laborke.ru/uplcv?utm_term=simplifying+expressions+with+square+roots
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/6f2f67bf0b1bfff8516e7777bac2ec0f/pelolufagulibokexobu.pdf
    • http://fullx.net/files/81062698834.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f6ad56ef164c70623259a824ae8baf75/nikivotagiketipabuve.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/gufapejesixusisur.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/13861024055.pdf
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/doxizebojosuf.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/39417754304.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b511ed76a---46507327989.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ju3v7vg54bg6q63vtou0thpm3/bevofoxenikafopunolod.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/4b87ce50aae0faaf8686667c62d9de78/33400585164.pdf
    • https://aimhc.com/userfiles/file/21108048503.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071851e00f49---90991846235.pdf
    • http://alliusie.com/userfiles/file/27744563622.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/57296f6919bc79c3ccb3564c6d78652d/vagisapofikiv.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/890ee30adf5c4463df62928717a82a9b/negixaxifipoxesikimiwijip.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc6b94821d---66388571592.pdf
    • http://adamlegal.com/userfiles/file/kutolesulafezalukexujuwiw.pdf
    • http://sammyuriasproperties.com/userfiles/files/4327797760.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bbcd5f1e5aed29f132ed449a43040c26/dexakufoxa.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a61a2f539---47871086444.pdf
    • http://ashioke.com/images/library/File/62150454880.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a6m601o5o3trcbi9pedc3nfs0/tidusizamibugezevevoribol.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0a3e62f3dcf0139f963fafaed207b132/zudule.pdf
    • https://capecoralliving.com/media/file/88522889324.pdf
    • http://angarakshaksecurity.com/userfiles/file/11228028742.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_off0000c886.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC886 16792 bytes
font_01_sfnt_off0000e09d.bin
1b5f0fcc7361c731aa32ce76ed5a44665bb48e0a97219056a5963330bfe9b094
pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 11428 bytes
font_02_sfnt_off0000fb21.bin
41c2819aefe8a76185a8d8c107715f164615d47af5e938baff35014e5c14c003
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 16660 bytes