Malicious PDF — malware analysis report

Static analysis result for SHA-256 2408b0c3e80c1b50…

MALICIOUS

PDF

76.7 KB Created: 2021-09-02 20:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc879dfee472b7050fe9a5a2a14e2247 SHA-1: 1f89eb9e073853fad083f886762c8b9b65c91eb4 SHA-256: 2408b0c3e80c1b5002575c036825c513a2955708747d481ed8780dd93b1f9c79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aviatroglo.fr/IMG/file/75498258652.pdf In PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vree4dgohsmaivmev52pj913cl/wuxonufugotakofedonil.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/wamupafajidapatujiwapi.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/bitusapesemo.pdfIn PDF document text
    • https://brakos.it/file/jisojekif.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/69315572470.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/boxikavovirevuganamika.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/vv4c55a58b95r4ovns2pnc4bp1/93948469003.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/vubosub.pdfIn PDF document text
    • https://5udua.com/contents//files/29159896569.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/61356309982.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/89382589681.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/ropewuzekabiboropak.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/ganugafoxewiwanip.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ad3958b08---rinaxifilitamedowob.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99151a1e85---12644017277.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160885634c24dc---bagabevuxufurex.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/viloxujif.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/goted.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/d1855oo8j7tjs7b2cen91e5ioo/20954767225.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16266488451786033826.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16102bd19dfa57---kupojep.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161197763644d1---2727607344.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/vuvugoselosubezesav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+harriet+lane+handbook+of+pediatric+antimicrobial+therapy+pdfPDF 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_off0000c2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C3 11028 bytes
SHA-256: 91b1546af653874ba8a168741c0745009f467c836fc7735f8efed0b9a81385e4
font_01_sfnt_off0000dbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF6 18588 bytes
SHA-256: 09a7c8e5258da5b60bd7ce6f93070096c4cca71dfc6a536374e8707f818504ed
font_02_sfnt_off00010bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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