Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c9e4501a370df5…

MALICIOUS

PDF

74.9 KB Created: 2021-09-01 05:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3ffccaa2742c46592741711cb01ab7c SHA-1: 21606271d4078034f1b96d799b421a8306a48a9d SHA-256: 41c9e4501a370df5aa9a73a8d4371b18a6afd1bb30986e4b7b322e7210110948
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites and potentially malicious content. The presence of these links suggests the document is designed to lure users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://garglob.ru/uplcv?utm_term=words+that+start+with+q+and+end+in+r
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608581c2729c4---2794522925.pdf
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/25855211593.pdf
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/45411493832.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/nodewi.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077b64495e8c---dolexejaturafasupij.pdf
    • http://www.agenbenangbandung.net/file/18249671868.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160904e7f2c3c0---jexakerupimufavifovuwa.pdf
    • http://inhome360.ru/admin/ckfinder/userfiles/files/wijedunur.pdf
    • http://blackshirts1960.com/clients/876325/File/nulovuw.pdf
    • http://studio-rivetti.it/userfiles/files/41944264437.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160718f8b1f121---22970569948.pdf
    • http://cartonwrappingmachine.com/userfiles/file/43344763491.pdf
    • https://gastriklandsbf.se/UserFiles/files/mojezoxalimodulawu.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/0644409df8fd5f5bfda81fd7c99d9b99/busurunajaz.pdf
    • https://dejavuruse.com/userfiles/file/19488657293.pdf
    • http://kompletucetnictvi.cz/files/file/66161992093.pdf
    • http://cancunday.com/travela/img/files/45594342877.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b11b33fb4---goturodolebijo.pdf
    • http://wx-bm.cn/upload/ckimg/files/202108090144199715.pdf
    • http://winterwonderlandzundert.nl/uploadimages/files/54852050751.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/782c321716abfceafb5330d527a0c54c/34233024496.pdf
    • http://ketoanaca.com/uploads/image/files/23804423919.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160905a3fb30ac---2139573525.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_off0000c0be.bin
1813a463906451f2c3f30ff9659b7e130859d19394db7d1f2c52868f41db3085
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BE 17324 bytes
font_01_sfnt_off0000ed09.bin
49d2b2eb50fbf5eaac9a45b3732ba9768f8fc87f5adddb5c868fa9a32046fdf9
pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 10524 bytes
font_02_sfnt_off000104cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 16792 bytes