Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec18cf52e94082eb…

MALICIOUS

PDF

94.3 KB Created: 2021-07-14 04:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3221ef19c03231567729c4b8a7ff5a8d SHA-1: 8e783fa5a558df4376c97d0d70e54043beb4e867 SHA-256: ec18cf52e94082eb865540b9036b88aa28110216383ee0aefba165d2282e940c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users. Heuristics and ClamAV detection strongly suggest a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://garglob.ru/uplcv?utm_term=cush+meaning+in+hebrew PDF link annotation
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0af93ca5b---jemusukur.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/kusidakejafopike.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/74jlu044o3a7ier2nv7iaom6rl/56506240102.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/00e7e0fd891c8ab222fe0f57cabeaa0d/66456665603.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9264f8db77---53466779747.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/6b2bf793b1637fb242ef99dc988cd360/21065750156.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210527_AB64AD79C0202703.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/36426573306.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/1530674695.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///72647500019.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01e65c6c82---98083178516.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081874f2d34c---wofebolosatimowodogawiz.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/renetivi.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b726263e7f1---47983456563.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c56fd2353---54861340672.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/25d2cfcd67d1ba6ae65a023653a14b3c/lokutiwajaramogu.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/jirixeboviropajiwufina.pdfIn PDF document text
    • https://agenziadiviaggiocagliari.it/file/70060116563.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/sugelukulapabubogujirunaw.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/34ff06ddc8a7f01a890e9f5333cbc48a/juledizag.pdfIn PDF document text
    • http://hondaotohaiphong.vn/upload/files/33512318626.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/57qhr3cvbr2ho4ia83h8vjg4s8/tuvodilulorow.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb02f125acb---80285594388.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/wukoxubikugapizazebato.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 10648 bytes
SHA-256: 078dab0f1a0e97a31b913673db92270a50737ef7fc043c622ea2f6c8abe96d67
font_01_sfnt_off00010aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 18524 bytes
SHA-256: 98b12f4e8696bb53ff49e3b4f6a978f9c6c1db81673ee0170959491f2ad69ba2
font_02_sfnt_off00013a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15286 16588 bytes
SHA-256: 056bd9b378cc4a880dacfb2d70e96894685961ac5a5a8f5ab33d72bf97b7d996

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