Malicious PDF — malware analysis report

Static analysis result for SHA-256 e756ad79e967cf43…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 17:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee9ba2aa0f6af5232dbfffd46d6c69b3 SHA-1: 3173e54ec6d4a8b3721362161393a0dd0420cd32 SHA-256: e756ad79e967cf43e0eb33dfad5c98eb5e928d04d938ddd4e8e52d71111af94d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it exploits PDF vulnerabilities or uses JavaScript to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wonwon.taipei/photo/file/mazirurulen.pdf In PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/viruduwaxilugu.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/tibazaselegogejoz.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/90798616312.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/jafavibawijelubamijip.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/fovozuzufewa.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/58254764353.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/bupikuzalukisamanavadana.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/ririzivov.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/rasanotijeduwekuxoto.pdfIn PDF document text
    • https://upaspor.com/resimler/files/40643765661.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/banikusu.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/kavifesivajimag.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c416569af730cbed64b269f854b3db83/jiralopidir.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/34018697655.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/tigifivejodat.pdfIn PDF document text
    • https://insp.biz/img/file/65232838953.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/21840940829.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/darukubujagapof.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94af539da---bivegoxu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161393fb53848e---larixutojuberaxolipupe.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/vokezabebubawuzulenipur.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/xebosatubukivelunigaf.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/37687242534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=psp+ben+10+gamesPDF 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_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 10452 bytes
SHA-256: e0510444fa5d04fa70756241eaf552fdd0370cddfb2e33b11b4ac218b9861dae
font_02_sfnt_off00010987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10987 17068 bytes
SHA-256: e3395a9b10afa55cf3846e94db7eaf151e92578ce56cc8179451f079ed0d6e2f