Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99db531daf4eef4…

MALICIOUS

PDF

85.3 KB Created: 2021-08-31 22:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 002ee02bfa59610334ece059b07af018 SHA-1: 2802eab28637a6e57d04ce517c3256f5c46b9f14 SHA-256: d99db531daf4eef45b787333819396c362c1fcea0f1fbfad9a97dc1fce9ecf59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous external links and the PDF structure itself are indicative of malicious activity, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://synerhu.ru/uplcv?utm_term=data+product+manager PDF link annotation
    • http://www.prieteniitehnicii.ro/documente/file/bizigotisaj.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/tuxalefesurileg.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/4326414613.pdfIn PDF document text
    • https://bloomeng.com/uploads/91044467857.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/08/04/98355974968.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/tadujuvijituponadoxosuja.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/79198812243.pdfIn PDF document text
    • http://temple.mo/userfiles/file/64567466884.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/sepila.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de6371a59a---xivitimiwikeba.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-07-09/images/files/xesorumojezuj.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/77054723756.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/43872530218.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/87514641106.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/juwad.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5fea67ec5---ketipu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb241b576f---pelemomobiregev.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/87406666178.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/18359282789.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f4b6d7f2---35093962414.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d03cacb46ca2dae4f3fa89206cb3d627/vuluwijarofuwo.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202172112424.pdfIn PDF document text
    • http://cy2hand.com/userfiles/5757324846.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/92814448423.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/korawizibed.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/63531400446.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_off0000eba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 17012 bytes
SHA-256: fdee2f1094eb3ed49b034ed21f0d281ef2de3873d64ce85c1d463a567094d792
font_01_sfnt_off0001176b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F82 10652 bytes
SHA-256: e06c8f13ee3ef2e2c4960e4debb659ebe0410380240eee20c4066c1cfdbe9dce

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