Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5054fdd9608db5…

MALICIOUS

PDF

87.8 KB Created: 2021-10-06 03:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0d8256045902f95d7946b7432490ea20 SHA-1: 2047884fcb41793ee0cca61d408cbc90da9517c2 SHA-256: 4d5054fdd9608db5162378ad58381fdfdd31a6b315731326e0113384ed0cc25f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with common techniques for delivering second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=breath+of+the+nes+download PDF link annotation
    • http://tctrack.vn/images/newtech/files/gozegurar.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475cf67de8a---gikobivabademaw.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16153efe005984---gowusojulavugitoko.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202110file/2021100607333070554.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/wumakizodisaxonu.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/63136132768.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/gibugovazirirobebotopave.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139773a29b45---tovuvapas.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b720a70694---duditopatojukepinesebumol.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/wizesisubagetovode.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/82356204970.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/rezorebu.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/mesubaximamazoj.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/40998508074.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615cccaf4c21e---12405522893.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/60447914450.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/gobezaje.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/bunukubixoved.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/fetipagojipolej.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/51925580282.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/89171865198.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/2579510889.pdfIn PDF document text
    • http://metallpress.info/files/kalanemezelezatixeximenob.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_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 20956 bytes
SHA-256: 38c0b155fa439c7059dc052d91623cc79c282a415e76bfad2b110e8ef39ca5d5
font_01_sfnt_off000121c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C7 10496 bytes
SHA-256: eed9846b8abebd8b3d977dcb8b6d2b5af31fe6c603b26d2eeac4b532fdcde7e6
font_02_sfnt_off000139b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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