Malicious PDF — malware analysis report

Static analysis result for SHA-256 e357763f0d0fe9a8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 02:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 172f30619587a1b9b88e9fc2b2917609 SHA-1: 9ef180bfe6bef099135ddc807693b0deead91e5e SHA-256: e357763f0d0fe9a8e18df27583478c7c90af22e4e524f5481c7247f84d07ca40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://infrive.ru/uplcv?utm_term=nba+2k19+mobile+mod+apk PDF link annotation
    • http://printific.com/images/contentimages/files/ximuvatufuvofemofegaz.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa74f98f4a---46235619244.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/77395126139.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/deriranamufupanotabak.pdfIn PDF document text
    • https://areicon.com/images/file/donin.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dd26294a6---vewexaridatafama.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/lezigutimokogosap.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/taredawijapobim.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/fizovamifetixalisas.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/kalawemozonasifudak.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/pilutesi.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/dagotigogenana.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae8d72310195dde26c768c1f444ea193/miwitedubijuwixidewep.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/bilefatorid.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/xizari.pdfIn PDF document text
    • https://icbacademy.com/upload/files/joratox.pdfIn PDF document text
    • http://learningkey.org/userfiles/70279742032.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/tagilazidobut.pdfIn PDF document text
    • http://baove24h.info/upload/files/momukatepadil.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_off0000d6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FE 18528 bytes
SHA-256: a6b15fe7e34e247bd6b60aa30d632d6884f982c2481e58d85c7a96bab1cafd84
font_01_sfnt_off00010745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 10632 bytes
SHA-256: b398dd0939e5f3ac85c76caaeec636fef8427c3e3a80bc2a82ec5f5c73321a0d
font_02_sfnt_off00011f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1