Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43a19dfc979f747…

MALICIOUS

PDF

69.5 KB Created: 2021-09-13 05:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eec6a9d8952fbf66aabcc77b9596f1a0 SHA-1: e89bcb777d2cb237e6ee70aa3385ba827bbd1a0a SHA-256: f43a19dfc979f74786fcd7674eeb248638ae61d6a3b833c9d859cfc1315ab597
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb34818b8f---64695641563.pdf In PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350b393caf0---70052370608.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00b0af9e9---miputuluvo.pdfIn PDF document text
    • http://kyea.org/imageuploads/fenapir.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/rijizunob.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/12828150405.pdfIn PDF document text
    • http://healthywithhart.com/res/file/pefuxagetoxababibusanox.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/sutozezexized.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/duziwelezejaka.pdfIn PDF document text
    • http://bushurov.ru/images/files/87307162694.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/bivilazuzeb.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9ac76c241---61131260746.pdfIn PDF document text
    • https://atlantidegattico.it/file/pobuwewojezan.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/zomivijomasowuge.pdfIn PDF document text
    • http://bjjiffy.com/upload/bijibajetimig.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/31643372881.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/33672449336.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/zupigorevex.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/4219146231.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/224049338.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/joxotawixelolobuzefured.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/36454453304.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/fifopafa.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/dapofafegalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+pirate+plague+of+the+dead+mod+apkPDF 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_off0000b07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07A 15860 bytes
SHA-256: 6ca768681eebde84c736bc1e306bfadf54af76b21c6cbc66879a067a17bc382d
font_01_sfnt_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 10828 bytes
SHA-256: 427704fb3822edcc241f60a96dbd1c0d2b251191212cf42c5357aacb00bf24de

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