Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a6709bab60eed1…

MALICIOUS

PDF

85.4 KB Created: 2021-09-08 10:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f65d66e1c7ad6a2eab410329cfd15551 SHA-1: bd12eec08e49559b3caa626835db75db3139fd91 SHA-256: c0a6709bab60eed102bea450d7806812dc43444db9d559daac163bf6eb998a43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or compromised websites. The heuristic firings indicate a link farm strategy and external URI usage, suggesting the document's primary purpose is to redirect users to potentially malicious content. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/uplcv?utm_term=statutory+declaration+victoria+2019+pdf PDF link annotation
    • http://myucmas.com/userfiles/file/41284408935.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/gagupodeke.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/lisuzuzureramaxabosutoru.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/11f18f7f0a8833fe6c2e91c5523fa1f4/37002868771.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/taseraje.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/2679533480.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/82852707579.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54e6ba10c8---37068388647.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/22722419781.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/21292027265.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a17aab4fa2---27011193274.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d1d9979fea6500ba602ffe84a379e545/68496808961.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/2e98325138c40a3991890d76e7723cfa/watuzoso.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/bagetisusu.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/sqaaq03a70hrslor8h1ftsblp9/55388265450.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092dbd5080d5---vesofefixi.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/zopewu.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/voxivupuxamesi.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802e7fc589c---femajuwizininixugizusa.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f9dcb4a45---xibatafifovat.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/3292eb53057c1ffa434a563db8271b9b/sogukimagerokomuvus.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/g65hfmloiu2rk55jsdrrllp17g/wuxedejadonifagep.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b151eea43dc4c8019bd0b374a6116326/zolixaxufiwoxa.pdfIn PDF document text
    • http://alkanboya.com/files/file///mopobiwameli.pdfIn PDF document text
    • 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_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 17164 bytes
SHA-256: 5fa953e8f4de9f017cd630aa31400b19389b760d07b011ebc76c11d62218e988
font_01_sfnt_off000114bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BB 11264 bytes
SHA-256: 0a622396bf7b1be8b9fe605c903b08be7ee5f7f31201594b1ce42057db6e7895
font_02_sfnt_off00012f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1