Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e039783191562c…

MALICIOUS

PDF

72.0 KB Created: 2021-09-02 03:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 04bcaa84b229b2db8289446774a2f312 SHA-1: b1751890a9950298455e6790281c5f95b26d7d00 SHA-256: 41e039783191562c6580545acbe9f2e17486ce94bccc74809f035e13210c57df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is identified as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and content, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM', strongly support a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=how+was+the+meeting PDF link annotation
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/f3bv4p2tkh7rn3iogqlefh4ja7/nuwotaxawosefi.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/78845370223.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609423ddb22ee---56381107269.pdfIn PDF document text
    • https://highrise.pl/file/80766312041.pdfIn PDF document text
    • http://iteequipment.com/clients/65150/File/povagosuvatipipako.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/ledorad.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/50974674284.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/damuvaxepirixiro.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f191ce64bb---bexuzagorunupen.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/25936997302.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/35075166362.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5b6a54b66---7968261310.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/89b8950b589ddd74e38b4f660831399c/fobaronon.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/miwifaveseludaruzi.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/8t8chtb0jm88r60vslp1vhi1pv/vapuxuxabexu.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/43146468000.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/14656383240.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3da3e78e0---gedisifaki.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/bc6e08f1359c0d1c38a3872a1ad5ca1e/dosokibomap.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/gti7s8e99nmta27099pcor1uo1/16513186134.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/45248590449.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ec0a51686473130db64243d923e0d937/58307233102.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b4d65874ea186b1e22f57fdbe12784ee/lebupododelivipituvawezex.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_off0000b8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BD 16484 bytes
SHA-256: 41ddb3fc2bbaf5ae41056002e15dfe7561d88c83ac6b38f21066c7835d8a2566
font_01_sfnt_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 10488 bytes
SHA-256: dab2d6cb873e064786dff2c7427849f8550fd7e4bd0b0359f5724212477c5b64
font_02_sfnt_off0000fae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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