Malicious PDF — malware analysis report

Static analysis result for SHA-256 df22e57c5d0b8e0c…

MALICIOUS

PDF

83.3 KB Created: 2021-10-22 11:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 177aad59d09fb65c3d3e4f2c0a7cd788 SHA-1: e3ba8a96a9222b60c7af4b5a17354e67d2e914b5 SHA-256: df22e57c5d0b8e0c75172347ff3395d2d31fb3dd4078d7de53fca14730707ac3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://solis.altrodesign.eu/ckfinder/userfiles/files/kusixuvuninozefuxep.pdf In PDF document text
    • http://erbaytag.com/resimler/files/76080212779.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/58943300672.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/40335290365.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20211003042220.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/zinamidegesumesul.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/34524584082.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f2c29e7284c9e1c735006355fd421736/kupezeleka.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/jezisaganatogazonifezo.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/lawogolemiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ac0383e26d---81687293978.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202110/1633875235.pdfIn PDF document text
    • http://timocomputer.cz/files/file/pufobenitur.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/puses.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/tomusupapowed.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615f4348ed9dc---vejagikotigazuxa.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/8lt5ih4mj28aggsog0akhpnrp1/48431136194.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/lemikokegutufidogefik.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/patori.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/rakaboxewazafaredunav.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/82283872468.pdfIn PDF document text
    • http://air-con.ru/upload/files/23577920168.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/57466826730.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/junimixux.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/midadesesum.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/vItLtdF7Pec/uplcv?utm_term=wow+shadowlands+demon+hunter+stat+priorityPDF 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_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 10948 bytes
SHA-256: 280d53bb499c21c7fec4f17c6d38f4488fd80821676abc710630754399b855d4
font_01_sfnt_off0000f9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11207 17520 bytes
SHA-256: dae0f0c7ceb774414049c6f89e81dc977239792c4b28e6941fdb22e5673c30f2