Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda0f9ea340a7418…

MALICIOUS

PDF

77.9 KB Created: 2021-09-21 19:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 328579b39ae00fd3ad7053e015ec2927 SHA-1: 1f87cfc8b13621779bacf580580f6a672ecda7bd SHA-256: bda0f9ea340a74184bae1a7e9e353e127306e89070294765348a414eb76edb5d
156 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm designed to redirect users. The ML classifier also strongly flagged this PDF as malicious. The presence of multiple links and the nature of the hosting suggest an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://primaria-ciocirlia.ro/media/file/tolexenezazesevikerepo.pdf In PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/mizomemilukekur.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/69494808421.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/rajakagakip.pdfIn PDF document text
    • https://ikansambel.com/contents/files/dolizuwerakujazitapuvev.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/fokifabafogukabevirujiz.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109030245327552.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/vokegogezidiberarowuz.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3bfbe62d81aeb249bc4c144882b305c9/jupetiduzasiti.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/bikisupujanemimoxigebit.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/dadakirumu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e78540c48---33216978973.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/o452ohadd1eriitcjr384ei9sd/348812970.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/rotoxarezovepezul.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/seninidugijural.pdfIn PDF document text
    • http://hk-keber.de/images/file/pomigewasarofoxiruzifof.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/50902719200.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/3435836057.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/lotokozaxopebojidixe.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/sufekila.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/97394339765.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/91688328825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=stumble+guys+apk+hackPDF 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_off0000cc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 10924 bytes
SHA-256: 3f3d2e42c55ec577506e0250abe2cf253f24ec0042b58c2854fd302cefe39135
font_01_sfnt_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 17212 bytes
SHA-256: 902a4d242c84fa0a0de96a97e6948a49d21862629a8480610c32551bee22016e
font_02_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1