Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5af404bc5c311d…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 00:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6b4c1acf90d5d3486aa02636763bc151 SHA-1: e05fe4b500f51123c21335cf37dd64091b9070fb SHA-256: cb5af404bc5c311db1165a4714f1388ff57b0f9b7f9cfe3185c08f91e5479e40
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. Several of these URLs point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://nomylo.ru/uplcv?utm_term=business+description+template+pdf PDF link annotation
    • https://artinterior.bg/userfiles/file/69014299963.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/42494026755.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f6bb3ceec---34057884563.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611f409f2e86b---58220394776.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210829210617_62173515.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/kakiroporomejomojetasunak.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/32515401912.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/dimebuxinid.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/rusovazoru.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f0c3c03d58cc06fe8001f3121a5a72c/72460635140.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/sipidunadukaxag.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/4697198658.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb032cccf4b---63962108455.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077a0ac59693---rokuzipaxerowo.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/24788887946.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/bewiworafi.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/notufo.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/pamilojapazawijekiso.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/17213917192.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774821ebf4d---fapuxuj.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39421a97f---gegurodesirivakidewug.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/82073909309.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/2b57d452896969b9d654357c93401508/53091348685.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/tanusavarusolavokaraduti.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_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 17788 bytes
SHA-256: d71f5163808cfc9be1090f82c46cff0b2d328a2cb02760d73fd53bb45c24cbb6
font_01_sfnt_off00011b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13321 10936 bytes
SHA-256: 021a0ce3378b47c522e36098e1d10c69c22438304492e57cc6cf5e4737c179e4

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