Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9eb13ef2d59f98c…

MALICIOUS

PDF

90.3 KB Created: 2021-08-30 08:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5153aee9582db184db457a1902c5b778 SHA-1: 188700621a29a040a65c4300c0f9bbd1288e9129 SHA-256: b9eb13ef2d59f98c75b6eac8752283b5a91b5d3d7ec26c88d3f9b9dd64ddd143
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely to host further malicious content or redirect users to phishing pages. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb6b2a285b---60061883758.pdf In PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d30b0a45c1571a2a2265d6e67cc850fe/nogogiz.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e64826cec59---nunazikede.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa41e2621f---8647669583.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e61b106d54553744f3af1e5289430038/17020645296.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec2c5c06ee---6833496106.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/9274084688.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160e63d6d46447---46202690984.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b890287b09b---97150043201.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7010279703995b525d987d0f9f25717b/xibobogezabalozulitetig.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900f576c55b---31631625022.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/jefojuvegalel.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/73e902a9076ad57d855128c3965bb686/32510916493.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/dac0b1769631eb103c5533f9790659b0/zopagifivon.pdfIn PDF document text
    • http://biomehl.com/images/content/files/57507527490.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/39e7d6a01134eb8d50f1c71554d90cb3/xerelopiponaxutixafo.pdfIn PDF document text
    • http://cke.hk/userfiles/dugopubikarasalaxeguga.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d70f4262d6---31030598619.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16096c6ef37a26---moweromixoxejejutulobesif.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/73407278518.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/zilowaror.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/miwazajefalasojawilepe.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/kavisibilafasuxiraferonak.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dcbb9baf24b---varawalabapuxuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=means+of+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_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 10412 bytes
SHA-256: 05925fff7aa52da48629b97b106b97ff869b7a1ebb5ccbae4bc830e73459a6c9
font_01_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 22332 bytes
SHA-256: 8b3fba6dabd81a9bf2fb41b736cd3d7c42c667584ee86fdd92d50f030811291a
font_02_sfnt_off00014337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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