Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c306bafd371413d…

MALICIOUS

PDF

72.8 KB Created: 2021-09-19 06:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3568ae799b62b062bcab7f5a2865062f SHA-1: 79aa3fe6d1e50ef99446efd023b702f9373bd80c SHA-256: 0c306bafd371413d45ae4246b6867372d69c39f0a191f64fa78929ca6f8292bc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous URLs, including those on disposable hosting and potentially compromised sites, strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=how+to+make+android+look+like+iphone PDF link annotation
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/nujidox.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/vofadelozexexudenis.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/vuterali.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/255350bfc5035775738c187483a4e6fd/45640100405.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/niwaxogu.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/lufoxawagixijekufunovuro.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/96184195959.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/zilevujolukidotifa.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/tizisotizal.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/3339014497.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/josozazefubimikabajakeja.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/jaguxofopapepusatowapugem.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/78752297283.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/89509233506.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/65383176638.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/xeserezupedujigewijin.pdfIn PDF document text
    • https://norservis.cz/files/files/vofoz.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16132f6d03c58d---nifuzowap.pdfIn PDF document text
    • https://flyags.com/editorResources/file///tezifurapej.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/nejugido.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/legegixegujid.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614105f633667---99049987321.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/70022882573.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_off0000ba8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8D 10656 bytes
SHA-256: f51ec34ce50d132c4023c035e50d64ef8acdd2188d745a43ad415a82ac1f3545
font_01_sfnt_off0000d2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A8 16648 bytes
SHA-256: e0a934c2dc0b200fb56a27256e15652259c86d60f63029857f05b47af61b905e
font_02_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1