Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a20b9b60d3282d2…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 13:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 419f5b868f7b6323bebc9876f282777f SHA-1: 53dbcff51bb44d3391f545dd82da51bd78db93a7 SHA-256: 4a20b9b60d3282d21aceb4dadd4247782272dc1b0fcba70c04a86be3c744c5e8
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or malware delivery attempt. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social engineering tactic. While no scripts were directly extracted, the presence of numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggests a link farm designed to redirect users to malicious content or exploit kits. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jjmcp.jp/userfiles/Image/file/nugib.pdf In PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607667a7072b6---vefeso.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f016196723a---33212979123.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zemalakoxireje.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/dd6d6eb25f8835f12d4d5c76a82047a4/6474849372.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b58a08211c---nogomijilalirubedev.pdfIn PDF document text
    • https://grancom.by/upload/docs/88264967271.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/87138472710.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/rififegorabusezira.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/sawewu.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/61367071555.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/54397769512.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/50323255590.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/84ca27bbc764b6e9d495aec9d7bca8b8/76764007535.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160831eaa4abdd---baxobanojotavipusujelanis.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/voxozeligerebuzozeno.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/zevagiwika.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/futaj.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/zasukorof.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609e144d651e1---zaforirosuwuxal.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/551oon43ahajok56a1padkq9q7/tozepude.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/ede5f7dcea6bdfe8e8d76cf7c5308827/41797437415.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3cb9c09fb4cf510e6e8483154ea8f263/32113324571.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ife53qh80neuog9djqbn80v1r5/rasunezejovowaje.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818ecd4dab5---57201741173.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075626a96c91---lasanupejanigatinel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=english+sotho+dictionary+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_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 18800 bytes
SHA-256: 051b7cc2bc91d977046d0619922dc70474b31f23c8cfec0f0a1907e4a851c755
font_01_sfnt_off00011ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 10864 bytes
SHA-256: d766c3da3cdd2435d4d3b7e1b4c0b23c843db7534cbac87de98e99b335204069
font_02_sfnt_off00013385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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