Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd491cbb423fbbd…

MALICIOUS

PDF

97.2 KB Created: 2021-09-09 08:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a50d3c04042b5697e781d2f9ed58db0d SHA-1: 44d9269d9c931d374e57c9b5c510e09e821b492c SHA-256: 0dd491cbb423fbbd92ab39de652fd558b1b86ada94023091c536c163668a6559
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to numerous external URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://openkomm.yussfone-crm.com/userfiles/file/50436617279.pdf In PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70276782169.pdfIn PDF document text
    • https://auto826.com/uploads/files/25031259816.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/murufefif.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/49616748487.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/71138495454.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/71348432581.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/dibefalejopixusip.pdfIn PDF document text
    • http://brlairport.com/images/file/tonekunode.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/feforideludex.pdfIn PDF document text
    • https://intersat.lv/files/file/23753917895.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/68321005766.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f8ee96b979e9ad2f2e0ef6102c9f8757/kapekinu.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/83672037211.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/dosufefenoximavatemorul.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/xalazavaduvifi.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/xipawizeminokapetutoz.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f92113f5ee17f97700ed032bc05e0c0b/bebemozologoverufiwuru.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/15408398990.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351f4576e19---bowejodumibowuto.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1chpieo4i3ugjsmvbonh0shan6/78825080162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+law+of+success+in+sixteen+lessons+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_off0001142d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 19332 bytes
SHA-256: 5530b2ecdbc00324ceb1a165dcd435310e3969160da8147b1e1874d24184a982
font_02_sfnt_off00015e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E10 10868 bytes
SHA-256: ec7a7594a62f75bc019d562a4ba3d93517f5ffa3e0841e7ed78c8c643293e5a7