Malicious PDF — malware analysis report

Static analysis result for SHA-256 33acf57b98a29e65…

MALICIOUS

PDF

71.7 KB Created: 2021-09-07 01:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 67e7368fd11838ba03a2bc0450a58be5 SHA-1: b5baa9ffbcea6557a1ec111862ede4b241afa8e6 SHA-256: 33acf57b98a29e65a9c9e5895b3160775d14d31eb6858ce3c4355cfcb7618634
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics confirms the attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://holidayservicemarsala.it/userfiles/files/pedawalamibofek.pdf In PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/44386122302.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a3410a7fe6d---6926369638.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/bigugizuzufowaxosurojasow.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/36216270283.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b1e22936a9dff31ab7fb1541b477f0f1/piwifimolikopetadev.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/jawojidew.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/19924026096.pdfIn PDF document text
    • https://bor-diing.com/upload/files/nevisazolog.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/33865638869.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608710e339a47---regisebonodakezutef.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/wosarinevarapira.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/63521589449.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d885bc5f---48393955640.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/1bc6d0e91de1c212b9a3603c273d42de/lasur.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16114dced2dc9a---14943757851.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/12233127215.pdfIn PDF document text
    • http://flexa.cz/docs/file/xufimekasexigoxate.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/kirovubedebe.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/jaredilisamekizizudo.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/zemorotikuduxusofus.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/zagufejokuvodubijexoxe.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/36997988871.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/38bcf5007e7cf7489cf9704d300a30d5/vefugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=triumph+speed+triple+955i+owners+manualPDF 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_off0000b69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69A 16108 bytes
SHA-256: 3a21f36dc98a8264670dde89b9d8d4325b8cce0b186a582c1236c7e36491f0ba
font_01_sfnt_off0000dee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 11108 bytes
SHA-256: e9d06f26cc631fc41a3f13b0d25d2d7115dcbaf5d7ed42c8c5ed312be63b16ab