Malicious PDF — malware analysis report

Static analysis result for SHA-256 5041c38874904419…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 05:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3f45b7274f32ed46f87dc92a2ed8f1e6 SHA-1: ff66de3a0985c28f3ceb32dd1e763a30c6827945 SHA-256: 5041c38874904419a8121008ec062d0eb0b60d68b38016e1fbb8dadfe704d813
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/4862405418.pdf In PDF document text
    • https://tese.in/ckfinder/userfiles/files/73510074439.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abd7cc38d1a---wuvevipowep.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/daparukiraturasimun.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26e8cc8f3c---76745320177.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/57943814220.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/gidonibupukaboruwomoz.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/97770142110.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/neloxe.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/85100735438d8cd1098b586612f6b5d0/27895531321.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/95489605378.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/306600ef425489d8fdc4b641495e76c9/mojalolebumu.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e55ed39dfa73b960d6f76bd6be1457b7/supotekamemuxawalivoba.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/17275837082.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bd97c5ba793---sozijenugavegalejawosoni.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/1cf8c608c92a7ed2fc76152fcfaaeb47/mewimuwezotusovor.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/75796265961.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/l9edbs8g9jomhbmnm76du4qimr/76419530245.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/vulabi.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/39311e647f7a03181ba211a4ff7288b6/50413477476.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/gifelid.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/liwobewugojutex.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210723_2E203512C6AC6847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=clinical+pharmacology+2018+pdfPDF 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_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 11316 bytes
SHA-256: e67abf4ca68c05c867861d690401a6f9f117731efc0691a52314ca245de4e037
font_01_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 18700 bytes
SHA-256: d5b08ae183afcccbeed3d52a80095563af1879ef5aeb53740f0600448d41bc98
font_02_sfnt_off00012848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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