Malicious PDF — malware analysis report

Static analysis result for SHA-256 5318551c9e6322e9…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 23:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9829e5e5a43582e4c08f4ae6117dabb9 SHA-1: 2ef1fb185e0d93fbea4c2bdee9e8e32b84ef9909 SHA-256: 5318551c9e6322e92d8bed4a6025e181239444087b8fe89552aa622912867df5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or distribute further malware. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070c40655230---75985696074.pdf In PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/vabulopelomujan.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/fb2762027d889c0982ee7bca63669447/pujonabesurapomi.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/bb7b6j249s57pdbl1vin8rj8u0/37694687953.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/sesepeferosowitu.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/080ae4fa7866f0c4746e82ee6057d566/fokixamobu.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/53691044281.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609457eb903c4---22120586052.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/12854912213.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/lagog.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/fuxowesofiwaritudafitati.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27691904f6---75037261889.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/jesatapotiwiwuz.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/f03b9ca51d9bd1e3cdc69994ad1f0cef/vibijof.pdfIn PDF document text
    • http://screen.by/images/file/malukadij.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/xefoxenuvuniwixawaz.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/48074628296.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/80977770650.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607101aff2617---78823757577.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/tezamusamunujok.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/72626d50d671786389d8ab1f7265f9e1/zizopojulef.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ccfeb3980---17333087220.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/2263833754.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/37109273360.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/54361769957.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/38092162233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=peugeot+307+hdi+workshop+manual+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F4 16408 bytes
SHA-256: 15a8447bfbbf88cec92988f93442373ab92e831e113c3b1be511d1d4b4764692
font_01_sfnt_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 11568 bytes
SHA-256: 13e792062103d4679baf6cb9b7cefad377b9a2dd559eaf2aeac7532aced15d83
font_02_sfnt_off00010cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1