Malicious PDF — malware analysis report

Static analysis result for SHA-256 b926119184e4b057…

MALICIOUS

PDF

73.7 KB Created: 2021-09-20 14:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: adc246c02453c51d8322f03f798ab4df SHA-1: 3362d0d0b20e2db2f7ce59a5a5088d803e0d092b SHA-256: b926119184e4b0571849564dcb4fe9161a2c7d75a48be790c81896c977e91741
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, but the presence of external URIs and link farms indicates an attempt to redirect users to malicious content, likely disguised as a system update lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://smidgel.ru/uplcv?utm_term=atualizar+o+sistema+android+do+celular PDF link annotation
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5it6m8fpjib3ii6hj7u8ruaqkn/59232082712.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/jiges.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140290672694---66046002292.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c905cb4cf---25589945697.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210912203814.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/67325748800.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/82414608239.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/95021645074.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/widiwabobadukotojuje.pdfIn PDF document text
    • http://inica.org/files/file///16736967819.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/9031032686.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6eb0c211b349900d26cb535c95d2ae32/doroteruzij.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/42380196629.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d54a0642b1---53787644087.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/dakapefedizogipoletexe.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/sajulunavogukewomi.pdfIn PDF document text
    • https://guijek.com/userfiles/file/nugijebekamap.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/53546311538.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/vubevaseluradusujo.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/kibiwawoxexan.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/remevuguvija.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/pikudevofi.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muvamijojanezuso.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/ditomeduv.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/ralepaget.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/wuluzilokafegopo.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_off0000be92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE92 10672 bytes
SHA-256: f0fe7ca3f96333f2372ac2e7ca398f20d3be32d3ee1623a9070a8884513b9627
font_01_sfnt_off0000d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 16540 bytes
SHA-256: e91c30910d8e0d32b5b209cdc54f18ad8399e0652f8fc8da4019d53e95c2aa83

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