Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca93d209ac7c3f36…

MALICIOUS

PDF

91.9 KB Created: 2021-08-19 17:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7392827236e1d6b6e2dc9df588cef66 SHA-1: 7e048ec797c8705192a2fb0794731a3ddfa703de SHA-256: ca93d209ac7c3f36587864084543fe218c1304a96b6344a2d9103be5a49b4942
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://larioenergy.net/uploads/file/rakaxexafarawedilazixosud.pdf In PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/zitevagowudevopuruwaba.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b457f3ae42b---58050979063.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16113835389d81---vedopoxolunetupimo.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-30/20210730041555327619.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/wixuxikig.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/tesikifasopodozeretog.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609431a9b7ba6---63863908708.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed3a6014aa---minarovewadawuzalakip.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160965d4254a2c---bejimokegukaredibeku.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5fc90160e---11896557449.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/tedumofo.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/arikqiosl09icvnilr1evb1435/sopusikesenoponowix.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/xijimofo.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/nogipovadigurefidot.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a0a29827d78b6a9ccc7f63d8be56a27/91790465651.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/sonojafenavuzorupomiwurod.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/607cc937e60af3db6d0e6df564583614/57314072384.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/degosizo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/ruwega.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/fotinazuduvazesomulo.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/32da815b0c2bc566f8be83a47100d7f7/81977249849.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/pobifekivalofetero.pdfIn PDF document text
    • http://gillyard-johnson-mahoney.com/clients/62114/File/tudadevunobowepedinoremez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=vcds+lite+1.2+full+crackPDF 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_off00010331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 10644 bytes
SHA-256: 5cf7c9c14b6581a198ab2972124a36c909b339bcdbca941c34fdc4fbe4673834
font_01_sfnt_off00011bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCE 17568 bytes
SHA-256: 17509278faedb91c8beaebeb5ce2448f960a718d296ec70fce552a92a476b077
font_02_sfnt_off00014a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1