Malicious PDF — malware analysis report

Static analysis result for SHA-256 23492b717ba5cf6b…

MALICIOUS

PDF

68.5 KB Created: 2021-09-15 06:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd924897041b09fed60f50f81284cbb4 SHA-1: c3f3e5c016d5874cf2e4a80d48458bd04433cb6f SHA-256: 23492b717ba5cf6b1a58c418534564bd8b55f45333fb09f76d52b0277707a524
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to obscure clickable links. The document embeds numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. No scripts were extracted, but the overall structure and embedded URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://queure.ru/uplcv?utm_term=how+to+draw+an+optical+illusion+triangle PDF link annotation
    • https://photojet.bg/userfiles/file/kamaluser.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/panunizojew.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/fenutabusadoxi.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/72790747717.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/49174089064.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/79356677034.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/kp8uokvbrs97obqe5o5s8ik41o/xenitokesopupizafawesu.pdfIn PDF document text
    • http://soc-in.com/data/media/files/zukezuwurerufetel.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161410ec7073ff---sivunazelavotixefupuk.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/84597866104.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/barekazizokowoja.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614164069d036---69383543254.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/3928307190.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/56906827887.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109031527471439.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vowojodejilalazorunebeko.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/masibadasuwedazemo.pdfIn PDF document text
    • http://redactron.com/userfiles/file/81087635845.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/roxesebazen.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/bigisumefene.pdfIn PDF document text
    • http://www.celso.org/download/kulusirobuxu.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/duniselivovigudoban.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e80f312c65---93515306484.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/bawavuveran.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/titizapakutuvulejuk.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_off0000b0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B4 13956 bytes
SHA-256: 21374e6709f6ca4011ad0148ab043a35b64a9899eebf3ed976ea8abb420f3246
font_01_sfnt_off0000d330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD330 10868 bytes
SHA-256: 804ce87c41ae9ac66dde64c0c2a24d10715e94f7aae3ad3baf89bef2e30379ed
font_02_sfnt_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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