Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1a7b1f4add457f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 23:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b062ac0a58f51b63fc722d60341e28c5 SHA-1: 45fe202d8c8df54c629597a6e145718c208fdbd6 SHA-256: 8d1a7b1f4add457fbb0b16895a667d941114792e692a7abfbecf39e5353ac795
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links are likely designed to redirect users to phishing sites or download further malware, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=mini+militia+new+mod+apk PDF link annotation
    • https://ecodiagnost.com/ckfinder/userfiles/files/85075782215.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/lozunefofazubiwedupo.pdfIn PDF document text
    • https://questyme.com/userfiles/file/81678974192.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/72636958729.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/vasijinadexibikorurozanis.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/26552507692.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109121954226839.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/60198116297.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/31011043014.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/zuwasesorikexix.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/11253029786.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2625f6e1d7d0da969a9ea246e53f109d/27382847211.pdfIn PDF document text
    • https://tierlistei.ch/downloads/92737052146.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/sipadazatavujenerosol.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/pujoje.pdfIn PDF document text
    • https://songhongresort.com/img/files/1881482352.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4fdca0a1857fabc2e2563de676d2b49f/purejegewamugufuraxuzufi.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61e819e63---ziwatobizojodixazon.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/nipevebanunewus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE88 10456 bytes
SHA-256: 3a6f92d3f09402212b807bf150219f8ae4528ed3928d7aa5ee4f9abbacaf9ff7
font_01_sfnt_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 18300 bytes
SHA-256: 0f002be470f730698e4046cd316c9abc8c02e9028c983c5ac1200aaff8b2d061
font_02_sfnt_off0001254a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1