Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7c410a66ea0efb…

MALICIOUS

PDF

76.8 KB Created: 2021-06-07 09:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7f1bb7ad0ee729d75bd65e39d95c7dae SHA-1: 87da4d1be2fc3bf6fe2cd2ca3b2bd960234f2365 SHA-256: 8a7c410a66ea0efb7a2706fbaf07b525ec2e967ce19e605061e02a0a79bae9a9
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ketchas.ru/uplcv?utm_term=sat+2020+test+dates+and+locations PDF link annotation
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e90bc0c5758285861c607210f4e0ae9a/pevavosedebobovurijid.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/11254565900.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/69774713354.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b487a76f6f---letofu.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/bepuxitezuzibunude.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/15d5756b8f45f9ca00f05a3d34d4e7ea/nidaf.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/24499028591.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0d107b740---koxinonuxepudasezo.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/pabexituleg.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/jilematupekefirape.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/bajeso.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/b4c0505be6df467c38c185fc072b1c36/12226447263.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/ragabi.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/33502457750.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/g4akjm7tkffhkbko06jhd509g8/bopolopijetadudewawewa.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/47bf0571fd538c91aecd63651324087d/99229924454.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9b71b86f7---60709257706.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5fd7d1fe---fezafagakenaxomemobefaja.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/23664280312.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 5000 bytes
SHA-256: 3c19272eb53d06acb30097d1622cb37e9336309572b53441168ec55b83ebde89
font_01_sfnt_off0000f1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 10972 bytes
SHA-256: bb465c0abc56a6fc7a9f5d8e791bc2fa3571a24aa9d996513493bc4d386e7d46
font_02_sfnt_off00011742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11742 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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