Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df3f077df04a046…

MALICIOUS

PDF

86.2 KB Created: 2021-08-03 16:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b991f891bb89bc5b7b13b84b74612e1e SHA-1: ad375ecf16f4bc3d53c41cdccc65aa89a17a5594 SHA-256: 8df3f077df04a046f5a737ed953f8d155a7be22fdb7e98e339e9a3bdfaff667c
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. Heuristics identified it as a link farm pointing to compromised CMS uploads, suggesting a phishing or malware distribution lure. The embedded URLs, while numerous, primarily serve to redirect users, making the compromised upload paths the most critical IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b518d33d97c---98677517074.pdf In PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/42438464288.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/1627f2be0594c772e7bc683b328b09b1/vawolumowukulixegazolupu.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/87799859079.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/84641411.pdfIn PDF document text
    • http://aimic.com/userfiles/file/47902566066.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c601d51db06307834876927a684fd539/bafizez.pdfIn PDF document text
    • https://alutat.com/data/file/4519319153.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6caa669bd56c7d8342f51fe9be81540/54866383024.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/aqhv7n2jmdkllkghm4n7sgf184/mabivuvituwejojof.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/13170671559.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957fa64d9ba---tetotinipawifavowefe.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/fufutasoziganosak.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/295e9695dde6228152d3634ebf90750b/30122894744.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/nuburevonopifefix.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/59180444343.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/3ef22fd43dc1f84634355694824c11e0/vivobeko.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/mtubemne4tneds7negsl9hh7es/fizofomanikanomovetix.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/521460f0e5691190e4f417e1fa8c4bf3/83290199747.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/88571475021.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/428db5e56aa3db477b870d9367b507c3/gotatazunezaforelodoki.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/70366451056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+mow+in+reverse+on+a+cub+cadetPDF 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_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 16732 bytes
SHA-256: b7a8d0c8b6d3dc62459ccc246cd1b09dfbf353ae24542903d9b1487b69a8665d
font_01_sfnt_off00011a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13237 10868 bytes
SHA-256: c50c2c67d3b529ba897a73fc8d02667e980da192af9b32ca9095a6b028486931

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