Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c00cc0cba65bf56…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 05:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 61b151cf30b92240c19babb8417f17e1 SHA-1: 8db2c8d25ee697f8de2134b7cab8ffdbbb74deab SHA-256: 1c00cc0cba65bf5687857381b502ad31653bbfd11674f9757795d8983c821d3e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087b47ac4288---25683863177.pdf In PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ilgu759n3facjgfs2ov4nqtofh/95205571817.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/89856446722.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/37527104206.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/279274301.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/dasukuba.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c8577b65cec62b1017fd1080f5dba230/fozoj.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/l48r85krnsj11ekd7e2ttuft26/22988153999.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/k0981um7g81n570mt5q80m5ri2/78053777481.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/8058236041.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160743b0f73c37---1449089057.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/e1941e24f3dcb48ef50c0f53e95482df/pizutuxuku.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/h4gp6jctfsr4m22hhj5759uv14/45287562810.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a94cd8a340d---risosogunowotufib.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/jusapapibisojubuperobovap.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/13414089522.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c260664c811---83627720475.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/6008c9b2208f4ba49ceda7c359d415de/vozonotekodixefu.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/16198076663.pdfIn PDF document text
    • https://rajakedua.com/contents/files/80641861846.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc918e1a1b2---2145028368.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/76617276642.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/4n423gmn9co42r7imiiep73u7r/22263416428.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fabef08fb---96642092992.pdfIn PDF document text
    • http://brukbet.com/user_images/file/zotaseb.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/89937762109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sundarakanda+slokas+in+sanskrit+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB481 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_01_sfnt_off0000ca26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA26 14788 bytes
SHA-256: cea7a2dced7c8e2c11b962b03c84fd9db5c6f53cb5cc3e38876e1f6534929ca2
font_02_sfnt_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 10628 bytes
SHA-256: 50e604ff1a23b8b44b86001ab14c426a9ad8e06d68a1eaada14b16112522cbc3
font_03_sfnt_off00010789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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