Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fd25890e195c71…

MALICIOUS

PDF

109.5 KB Created: 2021-07-20 05:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e40a0ff1bebd95b56c11775bc273709 SHA-1: 5f1758a53ec3e7cfe069958baf76905e9a6d2b2c SHA-256: e5fd25890e195c716ab31b2972472668abe2fbf2bc5e1f0bb2f88dd8fe6097f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or redirection mechanism. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cosmeticdermatologymiamibeach.com/uploads/data/files/54469213784.pdf In PDF document text
    • http://geometrabottero.it/userfiles/files/rekepujaretobemijupuz.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021051923074173499.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/zutazuge.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/ravugaderapetuwawegifur.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/rezetirag.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25b965951c---dogusedofewadasut.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1h2it5qsj1qk9fu177vd2fm6o5/ruletaluvafolobebokumat.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081ab85319e2---40975791940.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/jtkho8a59fmoj8a422n5ui4e6m/mupitagiluxeri.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/05lc5trvgqa3e8ql8259ep6baj/68967228567.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/etggh24annf0c9tscjc9p1k6i4/soxum.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/767c58e3116ed96239754bb45d6a0f29/69949840604.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/73610903007.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/mesiw.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/8a74625c32a78806cb5a36c6db8cfcd1/47054794730.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/au01lgu98og3dlql4k4866uh74/32866756314.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/40157079555.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/jutirez.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce58e9c4736---mizon.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/16u5g5j7m1deq9mt0nqt93dgoo/99196268941.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf37cf5d176---mobadagimewejas.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/fabuvod.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7f6a1af52---fafanuvagevez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=us+naval+research+laboratoryPDF 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_off000148ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148AB 10564 bytes
SHA-256: 2e0e7a3b07e044dc9b545f1cf7f902bda9eec946ff2acbe54e78b261a1d23cf1
font_01_sfnt_off000160c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C3 18596 bytes
SHA-256: bde5c422e7e29f334ca11e7611af832271244329ce2674ff17d3bd39c7dbfa57
font_02_sfnt_off000190db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1