Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e8b0aef3f8a49f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-10 14:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d16790cd7f8bbf37001f28eaaf349f1f SHA-1: 30cee7a3be5a76061b4fc20a29dbb0ccfeafa218 SHA-256: f7e8b0aef3f8a49f2ee84420991e4d7a6184a5e36a2e66c6592a7859852617f0
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tmtechvn.com/webroot/img/files/vikosojupaxovoxug.pdf In PDF document text
    • https://mahae.hu/files/files/gigopugexozozubas.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/63581016237.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/2771269993.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/37471283493.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/23831064302.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/83340174171.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/14038535391.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/garinugugijenetenatug.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/1g8jkbn3ckdqsh491pa6vcbvj5/rorumazerejaxokunosuvalu.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/23371707643.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/52476301088.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/nusabowigikate.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/81651607104.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3d37b4bcf43371018e5de0e389a10780/57524367760.pdfIn PDF document text
    • http://cy2hand.com/userfiles/94738930907.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/84480293413.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210903172319.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c3980e3bf2f151ccfb370d35a2e9f9dd/16562334321.pdfIn PDF document text
    • http://futboltotal.net/images/files/tuvotoretijotevusufe.pdfIn PDF document text
    • http://chromavials.com/d/files/lajilekidatu.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/5da902e19742adf550696a56a04e684f/51433298388.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/27959181146.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/badifofabu.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/gamujolewinuramesotiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+use+sd+card+as+internal+memory+in+android+without+rootingPDF 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_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 17608 bytes
SHA-256: 8072ee7d6536a5255524f59378f4122102c24e481a1969223838c97c6b5fc170
font_02_sfnt_off0001258c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258C 11108 bytes
SHA-256: 5f5e24b55466b50e7bdee0cc1e437e20692442e72e6f2ea2125d51dbbe3ec404