Malicious PDF — malware analysis report

Static analysis result for SHA-256 447738fe8477cb30…

MALICIOUS

PDF

88.3 KB Created: 2021-06-30 15:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 54ba153beda2bca5b62911cd0b56653b SHA-1: 0a4b9f97cc053401b62b1c32d721c3891740e164 SHA-256: 447738fe8477cb308cd3d0e50069344b4bf080185092c5e241cfd069bcb802cb
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to compromised websites and disposable hosting, likely serving as a lure to download further malicious content. The presence of a 'download button' heuristic further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=examples+of+workflow+charts PDF link annotation
    • http://ticaproduce.com/ckfinder/userfiles/files/31534432637.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0874756c5---25736841040.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/13e64b342a23d5bab7d7193bf938b8c0/xevopiler.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd8fab1ae1---72716507011.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/7uaird9cfs1r58hmhlqjkdlk3b/vufaretinulinofakopab.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/vumdlqg97e4gd54vvacnq3spfh/wovobuwegakidisevubudoto.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/lufufomekekolude.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a88c99184e720faba8f491ad05df5719/66321932208.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/cldakjd7ttq7mapqj1kfvhqin0/39025188845.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/130002126906.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/25249463375.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/oargu54qa6sc75e9cg4u3dv1q1/85681137951.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f88cbcaebe---16174660341.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/29888c522d80fbdb7a557888a1088402/firatuviluxus.pdfIn PDF document text
    • https://eventaipei.com/upload/files/29698928018.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/98276090039.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8c2a21b42e969a4223e3083d763a4997/65370995603.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca81518f78---nomizodijejewine.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/11966700791.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/87198052545.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/59802d15669a5868b75a65204d740936/93363865164.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa66412050---fimenakosaxi.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a744c783655---gozukumeverevoruvadamudum.pdfIn PDF document text
    • http://farmina.ru/uploads/files/nifewopaxujabomonevi.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/bejujupazilog.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_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F42 16692 bytes
SHA-256: 317725057dab8dc667a86218c7c963e6bde8712a5aa344f99028df185c35ce11
font_02_sfnt_off00013abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABC 10812 bytes
SHA-256: a0f11d6f9edafbe66a67d3b0967131741a49b1e6c12d9ed0db666f21ebd4e6f8

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