Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fea6bf955d2d314…

MALICIOUS

PDF

70.9 KB Created: 2021-08-03 05:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 64026579a90090ef82915f744e50597f SHA-1: 188d2b3a11e21df5dfa78ea9cb19684e2d2522c5 SHA-256: 6fea6bf955d2d3140bb9ffed8272ebc9eb4ae5b5df24ab5db5e8a00bf61f1660
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with a link farm attack pattern, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087018639e06---sulizadokunazu.pdf In PDF document text
    • http://applexin.com/ttpsea/files/file/jizexusuxiteri.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608707f3614df---jumaxulugagoderofenefuwod.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xopujexemu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b894fd467eb---81037805765.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/k8lo61c7jp44usnfdtrh5n6i9n/18956887975.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7jf08ss91pm2vcglm2427ok6aa/rumufepafetimowabizari.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/masejogovujugiga.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/46400872754.pdfIn PDF document text
    • http://househouse.it/userfiles/files/53433493446.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/57f8d5c2ec01f21385c93c07522be9f7/fokarupobinilomuzaxegokux.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f86bc8dea65---robifotowazulokufajoj.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16077dec1a866e---39915075408.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/28095736261.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/45290526012.pdfIn PDF document text
    • https://tdsns.ru/userfiles/file/19833313050.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968dd188ece---26350842509.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/dadijovaka.pdfIn PDF document text
    • http://i-dron.cz/data/file/rofigukovevugageju.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/54476600688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=2000+polaris+magnum+500+owners+manualPDF 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_off0000b543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD55 14536 bytes
SHA-256: 1e58d327f5105428a303e31fe90ffbf376aefabe0a5912beb8286534e234e861
font_02_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 10964 bytes
SHA-256: 2f944204b47087bd2653c5539a4d5cc786a7ac189dc291fe1fa68413d674d40d

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