Malicious PDF — malware analysis report

Static analysis result for SHA-256 a324ec35f276bfb0…

MALICIOUS

PDF

96.6 KB Created: 2021-09-03 00:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 938c26bc629f9c8dd896b6cb19a8bfdb SHA-1: cda83d315551b761f588a892857283671325846a SHA-256: a324ec35f276bfb049ffcb98d5cb7097a0d8829b5375085c4b1b842f3e8e644c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://defrokatilai.lt/images/files/fedobotodofe.pdf In PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/woserujipirobaratoz.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c9e335195---35325261871.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/43823813325.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/232d64d36d9eb96c72eb4adb6cf71d1e/85535541174.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/97947171094.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/rijovez.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/buxaxevetesewilekuburofo.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/wevorapazezexeg.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/20259126982.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/revepajafazuke.pdfIn PDF document text
    • https://motecx.com/images/file/lobisadonuzi.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9a1fbcb9dfca336d50dcb04b88e8c1a9/xalitu.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/0438676513.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/9931573186.pdfIn PDF document text
    • http://lblussana.it/images/file/17907825812.pdfIn PDF document text
    • http://state-lithium.com/upload/files/tuxusojisipesevabe.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/dosijedefukawo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a3a0ab8aea8---jegijawedug.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/49224913584.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a941174085c---59262638913.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/41618410927.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/najusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cours+anglais+livre+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_off00010fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 10772 bytes
SHA-256: 18d86f0b2d7cb99a1369731b3d577883694f850ccbe59c2f4da07822fe92ec16
font_01_sfnt_off00012891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A3 20736 bytes
SHA-256: 45ca21a047c0de4b675c56da3dfd621552f06a35239b98247867780d20af69a2