Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d18d0da3fe7915…

MALICIOUS

PDF

71.0 KB Created: 2021-09-09 09:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 27b6cf366ec641a85767d16fc5a42d5a SHA-1: 37555af903c047cdc703e0b79aff2f88de44a52c SHA-256: 45d18d0da3fe7915522e193eb6c55f555857a75855d3af58c0f2f21256982e05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of SEO-optimized keywords in URLs like 'nfs+payback+game+download+for+android' indicates an attempt to attract users searching for specific content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=nfs+payback+game+download+for+android PDF link annotation
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/zasupetuforixufetiga.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/pekeropusen.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/rebawanumigodovimaburusub.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/97703384960.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/aqumif0n03tsfpus26d6qv0l21/lubolotida.pdfIn PDF document text
    • https://kawanmto.com/contents/files/71906240419.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130130770bfb---16289578594.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/68458967217.pdfIn PDF document text
    • https://autoskola-scp.com/files/dosikizepigobokawobuw.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/tokumibuwunafewo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa798d574d---52798189809.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/26917720873.pdfIn PDF document text
    • http://knauto.com/upload/file///37199362243.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/xokeze.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1c85f53a456c032de889df28740c6424/sebefikawu.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/jolukorawo.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/70844342708.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/62675565443.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/meduk.pdfIn PDF document text
    • http://mfahk.com/upload/files/83236065955.pdfIn PDF document text
    • https://digireg.dk/upload/dukupusebibefamurejej.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613512e384fe0---tenekuvogoxoveb.pdfIn PDF document text
    • http://fnathservices.com/upload/file/bivosaxagalumejagakupaxib.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_off0000b50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50C 15404 bytes
SHA-256: 398254b98cdb6e01f24ea1549a0880dd077760b8c3709446ea6400051efd5ffb
font_01_sfnt_off0000dc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 11272 bytes
SHA-256: 1a507edd376531ff8d613bac44fc82e3e24afd4e98d8fa5984fefa61a5d4005b
font_02_sfnt_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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