Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f6fdd6bcb5e152…

MALICIOUS

PDF

164.7 KB Created: 2021-07-31 14:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9c83fa24752f2f7b76e1a91f847525d6 SHA-1: 8d14c44c13ee6c53bf6760786ac7378430ffc731 SHA-256: c6f6fdd6bcb5e152677d1a3a08eb41476500207d8ca72871038f0674c99533aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://arcenevents.nl/site/upload/files/74826709731.pdf In PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/62839344830.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xorigukatetagefixuxaza.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/59506423059.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ebcf2a1d---bexazuwodore.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f2d7d8e1---nemowogufazefizidevibigev.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/12900733806.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/s0g1jh1agrpdh9qe3hlkfn45t7/8860704713.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/latefi.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/408504de51c80e0558bf292e260c4a3b/20113541937.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ce52dda5a4f---tedagubolidaginuwofik.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5l93b60566nn6d7uug73f2bcdo/vobeparev.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/dulok.pdfIn PDF document text
    • http://aven.su/userfiles/file/32497818148.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b42c4fc4088---42229138997.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/f8d09377a1942e756a361f69c167f2c1/50858925479.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210621033053.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/guwutuma.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/tovufelirafukeluboza.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/vimaribiposowav.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/bejelozexotemadokuw.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/ditetavigupesetepolatore.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f4600310b73---62486737995.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/pumikinezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=of+plymouth+plantation+pdf+literature+bookPDF 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_off000220c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x220C9 19152 bytes
SHA-256: 6b1d3e1460f6600a8cf180ab81eb71afd889b23009b422a69334209247513f8b
font_01_sfnt_off000252cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x252CC 11068 bytes
SHA-256: 979c8201fc892f73e758b5206c7f7ee7a1624b02c39f4e018b7980c7d1707f85
font_02_sfnt_off00026c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26C2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1