Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b36d16d5633a46…

MALICIOUS

PDF

82.6 KB Created: 2021-06-25 16:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 22eba63399e76542ca814885f2ae5939 SHA-1: 165e7dfd9afcc23e7f3309a9cc43dad7b85c4d87 SHA-256: c9b36d16d5633a46cb0738dc062d09ec1078d5f4e0f763dbe21363c2de969d8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The document body is unreadable, but the heuristics strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fa33d9f2f---41883000394.pdf In PDF document text
    • https://lukili.ch/UserFiles/files/94022290307.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/sovofadexewi.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/22582380829.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/62dff8f32629d2407e0db1460aaacb54/lizajele.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/jo6n35gqoftjmo2bctmnj47fpl/xovezeneropudamu.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/56839927750.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/36805921039.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ddcee016064bda10be02b98a12c1cd8f/12686323518.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/nixiwikiwodewovo.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/71089479684.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/61236926475.pdfIn PDF document text
    • https://biocoils.com/img/file/saxorarul.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/kuvamopexud.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e187d89870---38646759126.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/e86063298bd13b23f69818cb64184cef/lizekulededesepagutobef.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/c4deef95f09732ef0a17c47329a0d909/mubiwunerakijula.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607267ac7e93f---mabiporogoruz.pdfIn PDF document text
    • http://cpils.com/userfiles/file/15889753085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=head+waiter+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_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 10332 bytes
SHA-256: 7fbca55643ce4c64fd0e282927f59f22abb82767493e2889e932fd58b9c70c4d
font_01_sfnt_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 18120 bytes
SHA-256: b49d946237b212b1668d41d3630fde250ba839ebeff0f67b7dbd59556c7f2aaf
font_02_sfnt_off00012696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1