Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5a946c86611627…

MALICIOUS

PDF

90.3 KB Created: 2021-10-08 10:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 997f4ad1cee1d2c496ed798c1841df33 SHA-1: 8b6014b70eb5be8f2bff701e39f5f4cb3f051253 SHA-256: fe5a946c8661162728e196c497ef308e0cea0aa1d8b64daf32ce47dcc77d5f1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://5974293.pasarantogel.com/contents/files/7043780775.pdf In PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161544e38e81c8---59158606694.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ad2196fa---93009610617.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/webebovesojovozoruwaves.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/xoxonololi.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/93539079123.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/33655951447.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/64710604884.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9c0cf5085e15db43a4d496f2f52d7ef8/tafeweva.pdfIn PDF document text
    • http://gro-felix.si/uploads/visokizonagasafunazeloz.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/10327908528.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/nuvofix.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/96336583657.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/25460464669.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/pazojexor.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161400f28226e5---tobotelugiwidusut.pdfIn PDF document text
    • http://yongqingtech.com/d/files/tajipoketodirererajibeni.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202110050548518651.pdfIn PDF document text
    • http://pronobile.com/catalog/file/90951008513.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/70956879501.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/83849185424.pdfIn PDF document text
    • http://studiodara.eu/userfiles/files/44630556075.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/27942194402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+all+american+rejects+best+songsPDF 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_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 10912 bytes
SHA-256: 2918944ed0266a1cc354744858e6143ab5e9f85e39c029942df8b5eb6b5d1c15
font_02_sfnt_off000128be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BE 19924 bytes
SHA-256: 38ec0d42e4d2248f33290fc61efa3838a595adc1589ac73cc80da602953b35cc