Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ae7f475c7b7090…

MALICIOUS

PDF

90.4 KB Created: 2021-09-04 06:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6420f1ceb53c3808e14a496a08cf7da6 SHA-1: f1ee40c7c3a69678108f823629cbe90edc119276 SHA-256: a9ae7f475c7b70904ab13e7959fb005af98607131d4c8a0986eacfaa5d539c49
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or initiating redirects. The presence of numerous links pointing to compromised WordPress sites and disposable hosting indicates a likely phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5497

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bayihoki99.com/contents//files/901823015.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/9995ab14f5b25a624c64760d374f0d75/vukeribemepurerovo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bibopevokudunuruwebe.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/famomijepewuwovipat.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efb1e24dbb---sabidotovogiki.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/2384390060bd54b0d3241.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773d24c397b---donixawuf.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/zadokirupowun.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/teh93kjnf6b8kvgaq8lv5gjbd6/buduxadelonaxupijazefu.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/juvikimibesebepuwuzowa.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/74509246754.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a79ddbfa5bafcd1722e148f23ace4592/gofepomajatinom.pdfIn PDF document text
    • https://artbynela.com/uploads/file/zemaxugatatelokufomo.pdfIn PDF document text
    • https://afayl.com/userfiles/file/50848657135.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/23690267859.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/77ec1a20c3ee2978281bac24870268f0/68818067731.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1611beffe93fb3---95647334186.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2895d03b7e56a513de9eb93c750ad821/80222656896.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210613_2C47236DC78524BE.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/45228224332.pdfIn PDF document text
    • http://tcihk.com/userfiles/jewefatorase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ux+designer+interview+questions+and+answers+for+experienced+pdfPDF link annotation
    • 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_off0001037b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 18428 bytes
SHA-256: 8c8ccc0d3a7f20204e9d33fcae6e44d5789ba536e9d6a1e530ad72103b1abfe1
font_01_sfnt_off000132cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE4 11256 bytes
SHA-256: 8af2599283b56e4f320353ab8124ab10f95d934cbda2fee8ebd60a9660ce068d

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