Malicious PDF — malware analysis report

Static analysis result for SHA-256 9359f30573b54871…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 02:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01d0061a02946726e3d2d0808e912b08 SHA-1: 403c6cecef923c054bd4f8e1b86cca397034f97d SHA-256: 9359f30573b548715819fc4e58b75c70f0a2434f5ba63ddb2800366234736f79
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the presence of 'SE_LOLBIN_RUN_COMMAND' suggests potential command execution, and the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://veterky.ru/ckfinder/userfiles/files/zujumosuguvenapafiro.pdf In PDF document text
    • https://xuongkhopbadinh.vn/images/files/xirefodirafeloxaxemowele.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/64768035301.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/muxesuwuj.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c1a02c05d0db95d985b03db02f9c6e7b/21668032342.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/73956603776.pdfIn PDF document text
    • http://qdcmd.com/data/files/85586312270.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/21866238707.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/pusolidalejigo.pdfIn macro / runtime command snippet
    • https://apoiotelecom.com/imagens/img_fckeditor/file/pazejigidede.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/66460552507.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/sigejuwegivutabinufuvob.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/mexulusiwolukijevi.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/nafozazebababojetodapupud.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pb97ok71q0k07kp55ki0sv5t75/betusamejozemoxojukosabuv.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/wawenel.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/47565785885.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/73874548672.pdfIn PDF document text
    • http://otczenacts.com/media/files/96954107579.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/subawunadil.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27432399366.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/mikofetebaroranaxojope.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/sumezadivajile.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/gelotogowuf.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/dbff1fcdb3930fc1184994dd7297166c/kigukibelerebudikogu.pdfIn PDF document text
    • https://sitycare.com/FCK-In macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=last+christmas+watch+online+putlockerPDF 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_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 10872 bytes
SHA-256: a7f97bffd0782ed9711bb390cb407a20c8810b1636142fd28b539804b8658bac
font_01_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 18120 bytes
SHA-256: daaedacb385db6809833fb6514b3543de86b2d2423ee8acda245318233dff6c0
font_02_sfnt_off0001226b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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