Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa9458cb4a90593…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 09:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ebe720d7d67d8057e91d5f9b0b0940ad SHA-1: e990ab939e594ea7fe000045680a29b466740568 SHA-256: 9fa9458cb4a905932e5100a8436531ec7f22db76480f62a5fe32668653bd83e8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://chcial.ru/uplcv?utm_term=screen+rotation+android+phone PDF link annotation
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/vulevobuzawisuzijad.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210919083110778.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/71796474565.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/40382796641.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/22845f85523cb71d2d677d036b2dea19/zonavu.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/lexevumixodofu.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/67353931206.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/83051933744.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e3ff8cb4e6c9fa2f768bc8460eb4c510/33413747198.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/makafixixafika.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/nikibuzusekin.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/58415771847.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/2109180000264832674fy24n.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/59790044135.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/67495707936.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/revetugu.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091518225318.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/67755154688.pdfIn PDF document text
    • http://termocity.by/pics/files/kazowitobepew.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a3a1921f6---lugizotorimusofexute.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/powemuzovapuz.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/zupigorevex.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/vonanezuzanexo.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/pujajijubakujulipapimoret.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/90438197796.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/73807398154.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_off0000e890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 17620 bytes
SHA-256: d1b57ac59e09182c368570d53e527ef97dc347f5df6ca55a51fa662308aaeb81
font_02_sfnt_off00012eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAE 10472 bytes
SHA-256: ad7b4fa3a982a706faf92257239548b4b5e53caa296df02bdbd725f8a4497a9a