Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f5b71979c5dff9…

MALICIOUS

PDF

73.2 KB Created: 2021-09-28 12:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffc9909793c6303d0e2b469f9e5edd1a SHA-1: 9924263ea495bce4d1c33d6a61ebbc5c45ab3f79 SHA-256: c4f5b71979c5dff990cdf3740c0a9c167fee1e0a5c8790c5002cbcac8aacc99e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed for malicious redirection. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://wastran.ru/uplcv?utm_term=bike+race+hack+all+bikes+unlocked+download PDF link annotation
    • http://elementsgogreen.com/userfiles/file/watirekufegalete.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/xoruniduwokinolanep.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614307475bca7---wejesenesalirekizotidiva.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/wasixunukukeroturum.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/79432070202.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/moxofulasafonitebanolasan.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/95044369855.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/60644928084.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/8021924653.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/tidirubegadevexib.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/fujaruxat.pdfIn PDF document text
    • http://deforma.it/userfiles/files/taleselod.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/fedojiwifajezipaxinojetad.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/tuvuwibedepujiwu.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/24382837352.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/45361060566.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/valufuwul.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/44271924374.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/84112644553.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/30544288354.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/fodutigeboletuvinowir.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/rigazesamapuxu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614e813ed7d54---81026982444.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/49451978494.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/99025165764.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/06676085f736c03728c5d62930d76c0d/faxerofidewu.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/87194887348.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/badugogomorukixekeliju.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_off0000b6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A0 10840 bytes
SHA-256: 0a1993517fa3ee1ca448677f2f8d24ce5a487e9fafc065482cb2efb39a77def4
font_01_sfnt_off0000cf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9B 18360 bytes
SHA-256: b9a7bce9358c984a2d7504f71040ca6afad9f84494d3be95d637716f68757e05
font_02_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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