Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd45f9e14e99812f…

MALICIOUS

PDF

75.8 KB Created: 2021-09-16 23:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73535b6078745a3459825e6dba17a66a SHA-1: 23d3fda0a64c17ba3967a01b0e422337850f91aa SHA-256: dd45f9e14e99812f7e2467c3db244664ba0205d6a7e8095bef1cc73d34ad70e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and a high ML score further support this. While no scripts were explicitly extracted, the nature of the URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' suggest a malicious intent to lead users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ebooksweb.net/files/file/bumafawamosawifeji.pdf In PDF document text
    • http://agavietnam.com/img/files/xajinarebesojuvagudasiz.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/50567022995.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/32253342414.pdfIn PDF document text
    • https://activepymes.com/pub/file/xetaketane.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/rufuguba.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/ximelakofora.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/jefoj.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/demerosorexivujarofeda.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/cvmd5kq247i9rtmk6fts1st1bl/41159351462.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/47106461340.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/2035857117.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/87321839937.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e647a925a---84524359472.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a01eeb17---76747989019.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/81291312686.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/gipuvixafirufoxerasi.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/22976391362.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/25193369362.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/64118311522.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/gatoludoxeladewe.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/77380727332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+go+hack+free+iosPDF link annotation
    • 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_off0000c2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 10732 bytes
SHA-256: a05b5228514d956f6722f5bf96a41106445653dd2397978a68fab11ae4a9fd4e
font_02_sfnt_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 17952 bytes
SHA-256: 6c5f3a413dd11d8ab00b04ba0cf1249254b313d826efeded5f2ec32efcbde7b1