Malicious PDF — malware analysis report

Static analysis result for SHA-256 134ae26efda5129c…

MALICIOUS

PDF

91.1 KB Created: 2021-09-01 12:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1343e53c7c3bea1292423df743fcb794 SHA-1: b23ce377cc6e4de41124ead594ebba66d8ef1883 SHA-256: 134ae26efda5129c6f3d9f393df1a1eb4023b3e5db72b956a297f451df91f907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the PDF as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a6ec26683---momapo.pdf In PDF document text
    • https://pacie.vn/web/uploads/files/fetuzebakonasigisis.pdfIn PDF document text
    • https://udruga-invalida.hr/files/banojusunujamurozave.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dae9bf70981---bawujavavub.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/38207086643.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16085d12846822---29446452550.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100eb17b8f5f---suzuwasinezezonufin.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/lumawakatejafawomawifar.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc097caec4---58522884602.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/72649806798.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/pufasizuru.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/19287256280.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/37275684003.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/8fd4a42b214cd3f76ea965ddd3738ee9/dusijudiruzefujodebiwibil.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/31610987063.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/biwalimuvek.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/l756qvg1dcopjc0rhihjc1r057/botazatogomujises.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ce3c528651639496df0c11bd8fc7e6e7/4799345063.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/3367a00ea977afe6e1a0b1fef82698bf/55700984103.pdfIn PDF document text
    • http://cwesp.biz/upload/file/wuwojar.pdfIn PDF document text
    • https://artbynela.com/uploads/file/tageduze.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3882d5a3dd83820e2101a021ed01c910/90408564048.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb197ac4fb---pexunupodiwovetinutineti.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/wozidunopaderuku.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/52502689209.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c026af6f792---62019685991.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/0ac8176109ad6f61b9a12161881ea435/12142973972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+is+the+weakness+point+answering+in+interviewPDF 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_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 17836 bytes
SHA-256: c31f72fb04230a32801c2459c0c44a59bc78882497bb87c98d9306221b727522
font_01_sfnt_off00012dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD0 10720 bytes
SHA-256: 8d9b7b1624bf122332c2ef131734c8424ed2b57535b49d8b30cdff460b2547b2
font_02_sfnt_off0001467e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1467E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1