Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd561a58cc11bb4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 04:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f527f837c106d93ed67d137e496a6cd8 SHA-1: 7ad1c130630a9835fdf57fc84e4053beba3bfa50 SHA-256: 6bd561a58cc11bb48d4d4d38ed1d36efdebd7a84c479673d36286b6c0d30244a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://inwebjor.ru/uplcv?utm_term=alternative+android+apps+stores PDF link annotation
    • https://olterus.net/contents/files/60597843550.pdfIn PDF document text
    • http://szjg.hu/images/file/pididatibowezubapo.pdfIn PDF document text
    • http://freeorden.com/media/file/64841880850.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kk8shkdtfpi1fh77bgittc0vpf/lokelavaxurot.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/91912022084.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210912153610.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/46259003962.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/jujulerixebedogotij.pdfIn PDF document text
    • http://ashioke.com/images/library/File/muzebax.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130458a77e28---36436768611.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/medumures.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/65929059932.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/s7sgb0vbcajaeq2jdkh5j5ajg2/bejipubedoxipul.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/34287980478.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/13003569823.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/12812176615.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/9817134751.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d93b4b50282974c98c4e4012f2208f2e/51099480842.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/91169686603.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/47099179821.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/39318822504.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161424efd3b277---10688243858.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_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 17600 bytes
SHA-256: 3b8e96ee4d54abf1446d4e9b547dc21d50aa38a81ff484014d215bb4bfddca96
font_02_sfnt_off00012045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12045 10432 bytes
SHA-256: ee883c15d2a7e56f5ca851297bf06bdfee380831749b001077b72e0bb3830170