Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48c36f710669355…

MALICIOUS

PDF

90.7 KB Created: 2021-08-11 08:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fbff6ae8f9ea8f91fdbcdd70aac05281 SHA-1: 8a229260e829f7e8787cfa22cf4aa3b23d108b0a SHA-256: d48c36f7106693559658baaa3471f08340f2329729b02ec1929df2121bcf8e80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded content indicate it's likely a lure for phishing or malware delivery, potentially using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/30186923708.pdf In PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/51611417210.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c5eb776fc---14182931683.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/4739943828.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/ritifalekilunutewiwerux.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/xataf.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/86350762070.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/68642900623.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da42449f5d---5347574386.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/4muanl8o87m5qtsj7tupu5a3lq/tuwoximinabogufokobibere.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079b6651cadc---tugezoxivoxadexizuvapedej.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/sudaboxobebivineliseluku.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160771915ed997---penikeraludimirovej.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6369f5286f---derunidopuxov.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/monezawilurid.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b3bd079c966be1b878edeafe36b02805/94957723602.pdfIn PDF document text
    • https://onecre.com/images/content/files/580660817.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/76216252b1c27428c99734ab35fd31ca/99235398856.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/mejuw.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/439a3e7f9a33da90c06f8a91ab4f7f53/wafoleruvu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c07017408e861e7fe0bb833bb556ed11/3017702393.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/52989936788.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/74139228838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+is+bba+in+hrPDF 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_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 17072 bytes
SHA-256: d720ec8ea15b930d12271c43b9da5088fc5ac3cde9a9aefc632ec566194ef8a9
font_01_sfnt_off00012e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E68 10040 bytes
SHA-256: ba92c0bd11ed4f0a4de91c35d4dc3bc85e85d6cfa90b642bc7273bae2e5ff39c
font_02_sfnt_off000144a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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