Malicious PDF — malware analysis report

Static analysis result for SHA-256 a719de4cd98a504d…

MALICIOUS

PDF

98.6 KB Created: 2021-07-19 15:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4145142c9aa692a8bfbd7ce1c3680db4 SHA-1: cc212a7b5babe7254d3db5dd189f2b33b0d2ebf8 SHA-256: a719de4cd98a504d7a7c00ffaf9c61cd6d3cdf583972e91babf338a693ff2939
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://sanidom.pl/img/file/62127874930.pdf In PDF document text
    • https://majorsagilekvaros.hu/uploads/file/70069849423.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qb6sfm6p5v57hkh70toa28anjd/19487805035.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/kakefepipefedikojuwesebew.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a45061208a---pemojexosinumemo.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/60778767035.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098412b2677f---kavutopevaluz.pdfIn PDF document text
    • http://stromzeleny.cz/file/lozibokizebonosug.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b73fc7e6ca---77893915292.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/75063194684.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/fowule.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/nevojuvebewaputuxenivap.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/sftqq75dfs443kqbq88hn6beul/96198850247.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/db9fc417beb5de3355c7604b10f4aef2/28433024331.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5f3ccb35dce8a57c106e8eaaf550994e/68522639656.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf4e9b04a7---13198330326.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/delitopawuxuvebuwilot.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d416c48cca9b5fd0051ba11d659ab78d/danepujulumikamaririxafi.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/38412244772.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5d32c0f5539725dd04a9bbacbec84f59/5768418029.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609402e2a0885---9370902174.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/5e27d215b59a89bf3e5e95b90737ae6c/jewek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=famous+five+first+book+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_off00011d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13551 18044 bytes
SHA-256: 531524d286c1845d2dba9ab5064ec957a82a2781b0448a692832ae088c653e7b
font_02_sfnt_off0001645d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1645D 10884 bytes
SHA-256: fe1dbce0d6ac7844882feb444434d7d32f93f73042d95c877a881ced4db6ce7a

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