Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4338dae08e7d5b…

MALICIOUS

PDF

87.7 KB Created: 2021-09-02 16:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1aba664a00ecb3c1fc2fe33e79378f6b SHA-1: 71cb554a42cdf871ad69eb981f39267f8144cb71 SHA-256: ec4338dae08e7d5bd477f778f8c046aebb43f7b5968eed1884fd3ba344d7d4a5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medicare-darmstadt.de/bilder/UserImages/file/617864498.pdf In PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/47c4lq7pqm576i4j5lkrhrtlu0/23247268719.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/nezivewesomumodawizi.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857aa8d04f5---23472156968.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/8b40019ef0a707959bf6add06bfdec58/dofidijutefozediseb.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a896fce7983---78432443395.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075741825333---topise.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609421e4a645b---23733811789.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/rojudalafozawinokezug.pdfIn PDF document text
    • http://ippon.lv/uploads/File/97457691383.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724146ccad5---12530666857.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091b7b65873b---mubasubonowunigovis.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/4860554519.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/88356113851.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/sifamuzusaxit.pdfIn PDF document text
    • http://word.mn/uploads/assets/68564454764.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/4ebece7a851be3358b7dae45fd1c39d7/somitajojapepeden.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/28033f2cd4538ddd2fb81fb0604df34f/misixapovuxatibadal.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/pemipozipuf.pdfIn PDF document text
    • http://cityfate.com/files/files/39705323946.pdfIn PDF document text
    • http://runo34.ru/attachments/file/nabofedanometasoveve.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/k9md253dm8l9g45628gqb5b1i5/90615748153.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/11793246239.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094fac0b4602---pexevaxulebop.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/25397481705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=siemens+euroset+5005+manual+%CE%B5%CE%BB%CE%BB%CE%B7%CE%BD%CE%B9%CE%BA%CE%B1PDF 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_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 20800 bytes
SHA-256: fe8daf701ecd26b9ffd41b6342677069b841bfb8d60d71a8f13c24d0a4f55a3b
font_01_sfnt_off00011b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13350 11488 bytes
SHA-256: 5cf7cea75830567821d645b65b91d9fd9a6b6cb493712fc901a00e3be7e7e448