Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbde7f7052875e5…

MALICIOUS

PDF

97.8 KB Created: 2021-08-29 13:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea1abcee05fa6a9ff9ef113903156b00 SHA-1: 2eee9dfd7614567a3e6aa6fb61a67379c8bda770 SHA-256: 4bbde7f7052875e53d59b05a188563db0c667ed2854833c23a6fd12a26926340
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. The presence of multiple external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://homearcky.nl/userfiles/file/67127493181.pdf In PDF document text
    • https://navliecky.net/userfiles/file/bikokudapuxitamekotusonow.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fddf1cd91f7---92032982855.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//31993137884.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/42447695172.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/c9a5ab0e1d4906e39b3dee2f22ded31f/pidelilagawaguboma.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/22141339664.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/mepapebuwubejanosetinoriv.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16119378902c08---87087466934.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/vawelibebi.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/35760874745.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/dovpai1if6s51sjt4ctlvc79u4/nedudedu.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/rozipenepukudonu.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/kovagalomutuvapod.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/zepinasonuxovakiwitaxu.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/42663990229.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/51942167744.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/38271295150.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ba165762cec---77208667196.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/c1j3drsouku79vt50nf2ckb6j2/79103013895.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/40918810353.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430001940578442.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202185017101263.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/661c6d5cb95af227db7f451ba12dde92/44732403502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=minuet+and+trio+formPDF link annotation
    • 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_off00011816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11816 19608 bytes
SHA-256: a7e0fee9fd8c07e7e41a51a1eb658b99118002f6f4c8d279c5dc13581225476f
font_01_sfnt_off00014a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8E 10396 bytes
SHA-256: 227bf74a1977b08d507e16ad3c7b8e70ff13f54c35b7f4ae0e75e4072c809b1d
font_02_sfnt_off00016207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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