Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc3ca428e933bda…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 09:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05d39dfc28866f0ad6596ddde9fb18da SHA-1: 2d7d5357fa23dd4ece83d88ff75d1e222e0340e9 SHA-256: 7cc3ca428e933bdafd467e9e1bc14c03332055c9dd5c6d4c9ef6faf2bc4c12db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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=com+samsung+android+personal+page+service PDF link annotation
    • https://divetechmarine.com/contents/files/gavafarenogimiko.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/xowijuviwipo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161315910a7c82---wesibuxudibukinokoteg.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/42748874503.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/16756333756.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/34aa537536bd890078e1e2f90b6d8b45/90103566038.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/zanelatux.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/27811450153.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/tbr6evrmrg4tvmeuikmbeolj52/89461635532.pdfIn PDF document text
    • https://ags-car.com/upload/files/tuturuluzotoz.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16142615b8c89f---papanezonujerojutaxov.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/12311045076.pdfIn PDF document text
    • https://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/56260574139.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/32393225811.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/84060019288.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/77393995262.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/rutaku.pdfIn PDF document text
    • http://byecook.com/ckupload/files/nitedezinudebedotareku.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/xosegabonaxonofuzin.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/44801458135.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109080622021902.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_off0000d60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60D 10956 bytes
SHA-256: 3a9283a8d13478fee776024198c9278808d8aae138d9ef45834348a9278e679a
font_01_sfnt_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 18188 bytes
SHA-256: 46a9951410c4ae9225c7c89d520ea5ac41adbeb8b9da8f98d2e200c3b826105b
font_02_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1