Malicious PDF — malware analysis report

Static analysis result for SHA-256 5966cf5741b6830c…

MALICIOUS

PDF

81.2 KB Created: 2021-10-07 12:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cabe5faeb325fb8fc3c375f21b08b388 SHA-1: 42c0c342790f9dd06c946c92bb0da48bda214ace SHA-256: 5966cf5741b6830c3cd752bb30326ca927754626419c6c6ad004e0ebbd3c7011
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to distribute further malicious content. The embedded URLs indicate an attempt to redirect users to download malicious files, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://kasihpaham.com/contents/files/wugemek.pdf In PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b978da48a1---pomexuxa.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/xabupoki.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/68641557632.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/9136945218.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615ce9123866c---9322979281.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/xakexolu.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/86254763496.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7eeb179a---diretomajonugopase.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/82582388670.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/10972247038.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/95894334573.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/9059669496.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/16879166427.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/wetebogarozidovefubu.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/kosesesojaxex.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161301a41d9ae6---31514962139.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/23665042009.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/91724469237.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/pupuk.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/fakiletusuwuguwuwata.pdfIn PDF document text
    • http://imbirimbir.ru/files/96166038877.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161597da54a943---mutiwibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=sax+video+player+all+format+2020+apkPDF 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_off0000d66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66B 18064 bytes
SHA-256: 13e509c390c10785502ac24667279a25975d313f791e1bd8d410cf1d34ef84ac
font_01_sfnt_off000105a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 11080 bytes
SHA-256: a7fd3cee8785781c95d1df890cbda48f701c01ec91be62655f4ab3bb92b0794f
font_02_sfnt_off00011f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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