Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2b2d3977cd6eab…

MALICIOUS

PDF

85.1 KB Created: 2021-09-21 20:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6da240fc6d1f26661851648281d09975 SHA-1: 9b733e27cb034016843f40026aae05a2b315e1e1 SHA-256: af2b2d3977cd6eabf5b93a16cd944091ac975c7ba493c1806e2e2e9cdf10400a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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://catamma.ru/uplcv?utm_term=game+pigeon+8+ball+cheat PDF link annotation
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdab96232b---pojumetasapogetixexep.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136f7383cdd8---vozijowulodetij.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16139965ac17e9---86085480969.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/vopamumomavejo.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/45232144668.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/sewodefefamupebevi.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/43be1ae13bdac5785a096f86108ad8a7/zusitujogikaxele.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/28788970734.pdfIn PDF document text
    • http://hocomesun.com/upload/zoveparajamelofijopi.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613361b235b79---dofit.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/gigoze.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/54758900508.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/97390184777.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6cecc682c---timorilizakuxo.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/16267095874.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/17b0682358717070ed3d25085c35c22e/5414487300.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/51436391469.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac37b3002---40081485711.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/vimuzijerujitajifufi.pdfIn PDF document text
    • https://aaaxxion.info/images/file/xokukaxalulanu.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/fediluzodugej.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/15461808248.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afae6969ce---99862417321.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/88069036250.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_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 10940 bytes
SHA-256: 05b8da3ac28e74e8f845541e0699a5709967200d08838fce9831035d4279bbcc
font_01_sfnt_off0000fc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 19476 bytes
SHA-256: 4d01321d4480c842e7924bc8adc1bcdfddb6a862ed24a27935e5b1a667c576f2
font_02_sfnt_off00012f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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