Malicious PDF — malware analysis report

Static analysis result for SHA-256 8249827ebab941be…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 18:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bb9f954846bcd258cb3cb76243468f7c SHA-1: 4556bf32eecbfdbc467cf68b72f7196f1971cf1c SHA-256: 8249827ebab941be2e2e7bf988a5d9163c4257aeb1a68f7ad60213e3c53aeb7d
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple external URIs and the 'link farm' heuristic indicate a strong intent to redirect the user to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://boatmonies.com/uploads/files/gawamexakadiweginoxinev.pdf In PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/jabovab.pdfIn PDF document text
    • http://taigesw.com/upload/files/18879430336.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3144eb361f---12228388630.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f59acb8052bdd933da1a78c52210305a/netepiliju.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/33934945527.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/34068251555.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/5927079215.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/30312208257.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608778aac2f73---67280618315.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2dfecebae---vepikeju.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/lutedofa.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9dfcc30d8---medibakomesokubokolujab.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/35293529128.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3564b67d4b---naburaduvozaji.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/sewefuniwoveguxazaziwalu.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/98017536519.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/63093771880.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/37657903887.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/69216729806.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/49178030638.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/pumifujivelufudoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=by+land+and+sea+march+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_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 10744 bytes
SHA-256: 1766d301e25ea0f8384e5eb7e9bc9bb40e037de4252909d41c49b7422825d41a
font_01_sfnt_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 17692 bytes
SHA-256: 9e9c6889b165e7a257a9056fc292ca2a0d1c3a0942420068d5a03d251ff526e0
font_02_sfnt_off0001344d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1