Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91c0686f3397ee1…

MALICIOUS

PDF

86.6 KB Created: 2021-09-05 11:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3cd753fbc84c5bb2b9e0e7595ca11121 SHA-1: e3575a371a89584a75137ca68b59651e173d079e SHA-256: d91c0686f3397ee114ef169f544ec9109613851a063679a5450a216dd44dc116
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pixomot.ru/uplcv?utm_term=communication+skills+pdf+free+download PDF link annotation
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/0a7fb571c492c8665f3d467adeed851d/40794403262.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/gezegemiz.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/972bbee55c70a88a666bccc9772a224e/nupelal.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/90841326523.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/jegixesifazomugox.pdfIn PDF document text
    • https://cubic.is/userfiles/file/19732421826.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/virabufod.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbe982977a---19202294119.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/37202185351.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a552fd24bd9---fifimadefinewajobo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5f0e0b45---42478655360.pdfIn PDF document text
    • https://cape-electronics.com/media/file/nelinikevurege.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/60681677431.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/49804219052.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/38603571891.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/jutona.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/tufusesajovosewolanovimis.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/31018963855.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/44369765611.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfccdd9cda---xusubokawur.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/sl2qv58a9dvj1ec9060hdo1d16/78422177169.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/dinukewaneni.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/73259850567.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f632be371a---1866037064.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/s8a9cgi8ce90q6as0oh345sokb/soxubadegozenakife.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_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 11092 bytes
SHA-256: d16f316ecaba05e1bad2f5345ed27c8e205db27e71025409f72e73379db6cdca
font_01_sfnt_off00010790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10790 17428 bytes
SHA-256: 70398c7b73b3ec1d57266a7505877b0784d8355d1ac35c750b81b6f7ae285cad
font_02_sfnt_off00013439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1