Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7947f0bb81dbedc…

MALICIOUS

PDF

68.7 KB Created: 2021-09-28 04:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 610f0ca83aac3447f7b4f7fada020124 SHA-1: 751d92e9c228d1c8633d687e81bdf56a65ecc102 SHA-256: e7947f0bb81dbedc47a7206253e460d21c225baedd0e3ee87bf37e6a172c0888
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures that redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=52+types+of+marketing+strategies+pdf PDF link annotation
    • http://amghanoi.com/images/ckeditor/files/57495187798.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7a603ed6fd80545df6358aff484b27cd/tunuliwigodatuba.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/lagifujodopo.pdfIn PDF document text
    • https://educhina.mn/editor/files/notisekivijavom.pdfIn PDF document text
    • http://vswet.ru/f/vuwijexed.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/3068235709.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/ponomabanegamupoledodof.pdfIn PDF document text
    • https://oferta.lt/i/File/12423687942.pdfIn PDF document text
    • http://grossbuch.com/upload/file/60591331718.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e85b97515b---fexazegamabapirig.pdfIn PDF document text
    • http://beta-rc.com/upload/files/zawetuwalusikuxe.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/pogubikaj.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/90087111933.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/benetoramiluwal.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614d60a298cf2---17191637090.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/54442722191.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/vasasulibe.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/49427965002.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/berunopopexegobakezano.pdfIn PDF document text
    • http://hanifeugur.com/image/files/39261217763.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614302618825f---wikasazogef.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/5199346527.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/52703106302.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_off0000ad74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD74 14812 bytes
SHA-256: 1fc278726249b897415fecd09835ccd11ec9b21e38c4e7b282f90aeb7c1efae2
font_01_sfnt_off0000d2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DB 11156 bytes
SHA-256: 7b686ffa8d7cfd0953280f946a17ab981af25785f1a19a3616b8607e85dcd8c9
font_02_sfnt_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1