Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3fb98f90e0e58f…

MALICIOUS

PDF

87.3 KB Created: 2021-08-12 06:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 65090a7aee614fdfd999fe7aa3e3b7d9 SHA-1: b26d46d8e642cbb9da107118d2ab45617c24b8ea SHA-256: 7b3fb98f90e0e58f2764147285d41d65085aacf645b8f2b0249bb12df592f37c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to external sites, some hosted on compromised WordPress installations. This suggests a phishing or malware distribution scheme, where users are lured to malicious content via the links within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://agrimal.pl/userfiles/file/xepetokok.pdf In PDF document text
    • https://cheesykeju.com/contents//files/sobelo.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/lopok.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074503f965cc---91970004561.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/41264333692.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbe6ad861e---254934083.pdfIn PDF document text
    • https://bataretak.com/img/files/file/pixivonevosizajufoniw.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcf31eb23f---34591494440.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607515c866617---faruxixofibuxulo.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/39d880af2bbefff661dca7ee7625110c/44359985932.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d19763b277---xapokuxaxoforiziza.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/52313321345.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/29851978187.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/818a103914242cf706cf60ac88ee1bd1/vudogunusuj.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/242ea17e352f92b86b484673f1a39924/kitujeziko.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc528d419dc---86353023709.pdfIn PDF document text
    • https://123natura.com/stockages/files/foner.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/p73pppar8v47j8jrjb7r5i41ge/nagivi.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/kmqqul0h1f7j3oph934miktuom/luzepagoderibobewifuzu.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/48755350721.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/47347682634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=como+sacar+las+dimensiones+de+un+rect%C3%A1ngulo+sabiendo+su+%C3%A1reaPDF 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_off0000e9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 18748 bytes
SHA-256: fa6e85097dcff5c5a8a03103ab0e1fa87429a580b8d3f8866f9ba7b92797de47
font_01_sfnt_off00011ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132ED 11164 bytes
SHA-256: 7c3de630e650d341e481593306bec970df7212696aad57db787e8e0ed5c62b47

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