Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae7d1834e02f71b…

MALICIOUS

PDF

84.0 KB Created: 2021-10-23 01:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 395cea47cad48bc6da369ef64ffa170d SHA-1: abde50705ed07bb8059f429d808e52d71dbb6818 SHA-256: 0ae7d1834e02f71b8416e1c5ef7daab1f7ac50b8d8e0d910af4d21e6a06028c8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains. Heuristics indicate a link farm designed to distribute malicious content, with ClamAV identifying it as a phishing trojan. While no scripts were directly extracted, the nature of the links suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://101doctor.com/uploads/ckfiles/files/61582da19bf21.pdf In PDF document text
    • http://lnianemarzenie.pl/userfiles/file/jopowegijorisidovaketew.pdfIn PDF document text
    • https://maria-galland.ru/files/file/57043977882.pdfIn PDF document text
    • http://dakov.hu/_user/file/dodamewewidurabopuvesuza.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/kawoladu.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/56726038027.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/31217d8cbb531f50c77de91e42811a3d/xitolixebe.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/majofufugomovude.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1617288856369c---talarobizesuj.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/ruwisagurikobagot.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/1835735706.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146441d07d71---61109437703.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/pukofetazit.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/59126108239.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16151ac773c4a0---30402635318.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/54683849760.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/4498293678.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/xuviwutibunuxekadoxeg.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/74973258776.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16169706b91a44---15503667022.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c7ffde7a9eeb0f3b5ba3e400fa518045/vososudikusoxobapunewu.pdfIn PDF document text
    • https://apra.pl/files/file/71742696841.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/xobenalad.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/oscUj7J0Gjw/uplcv?utm_term=wind+up+phrasal+verb+meaningPDF 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_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 10920 bytes
SHA-256: 43e84267da932a28e4e6b7c4f48133c2cf8e863024ea54002933e5960808a50b
font_01_sfnt_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 20708 bytes
SHA-256: 4baf93f15bcb1fbb47c2d7bed30e19d40cac462b424dc860456b335cb73a0f6f
font_02_sfnt_off00012a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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