Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d0384410e6330d…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 13:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 39272bc608a987a57bbf49e4159ee1b1 SHA-1: 0f7452a574d7807db861eb1474586d9598ba9d2b SHA-256: 59d0384410e6330d4dfcc9aae9330f8d4d9a3e59f805bf93eff2503cc003a9a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=how+long+can+i+keep+uncooked+chicken+in+fridge PDF link annotation
    • http://vandientuchinhhang.com/upload/files/80673258456.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e078d8118a---38141852650.pdfIn PDF document text
    • https://adikmanis.com/contents/files/peludujefulozije.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5a602fb5a---xovakukami.pdfIn PDF document text
    • http://unityproductions.com/upload/files/sewinirodurozuwusek.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/xapirovenixukewuro.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/zefub.pdfIn PDF document text
    • https://wasael.com/userfiles/file/tosavinutika.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/sepenudizulekavogupikuw.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/supuv.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/97725441285.pdfIn PDF document text
    • https://trakyasoftavukatwebsitesi.demowebsiteleri.com/upload/files/zuvowulewozefowelumi.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/nemiso.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/losemo.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/12052812882.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/saratoxul.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/60857833034.pdfIn PDF document text
    • https://codecs.ro/images/file/sesuzakurewobivisugi.pdfIn PDF document text
    • https://csodamalom.hu/files/files/nogubigalida.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/88944354267.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/48749230730.pdfIn PDF document text
    • http://calisnt.com/uploads/files/rabazukopitatet.pdfIn PDF document text
    • http://prestopc.it/upload/file/wuzidajapivewokofa.pdfIn PDF document text
    • https://nhatthiengroup.com/files/uploaded/files/89168217655.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/xuvegiwalevizavosorabota.pdfIn PDF document text
    • 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_off0000b400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB400 10900 bytes
SHA-256: 4d71aad2fafc108697d8a5cacef78c2eb307f6a6aa844fd0335f26353a3911b5
font_01_sfnt_off0000ccf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 14472 bytes
SHA-256: c830ad4d413c2bc6847924f3227cbf7df1718a0f3f1553ac2d62556f8594c03b

Open this report in the interactive analyzer, or submit your own file for analysis.