Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b04c9ac39b20038…

MALICIOUS

PDF

91.5 KB Created: 2021-09-02 00:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d8c92840dc8935dedb8148ae6d255988 SHA-1: 9b79c3d95768c131ded0a2ec7ce919079580c48b SHA-256: 1b04c9ac39b20038521ae20f8e4cf6ca130cff1b8f5ef44ad8282398064a0be0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=southern+cross+anglican PDF link annotation
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3589d0773a---73694920607.pdfIn PDF document text
    • https://petikdaun.com/contents/files/98634769271.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3a33f43a---63012295869.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/vozexebawivirutuwul.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/a1foo9t245hjnp7h2rj2a58avi/fusapidifemozubo.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cc89ab1ff---nuwobuxefeguvawiw.pdfIn PDF document text
    • https://eventaipei.com/upload/files/lodupaduza.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/82241717538.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/0kqi3mddcb0l2i8gqtsffdnre9/77046292897.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/hkiuhgkdquhf4jvp9f2i5cnebl/42942083521.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210630010759.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/96882446124.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610f9a6a16616---dobirenoko.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/baxuwovepoto.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/paneg.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e65f620bd89f21d9806f2c88b175ef1d/movozajinamozotuvameda.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/fowaw.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/64579428510.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/55252055204.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021082608574065954.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/63187774155.pdfIn PDF document text
    • http://cymagun.com/userfiles/jugilejaxapadox.pdfIn PDF document text
    • http://sun-tes.ru/files/file/41888099206.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be93251cabd---1142425148.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/vununigetagovagipoliduto.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_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 10684 bytes
SHA-256: 0c1f35a20f90368e5ce13864790f286200dc2e6bc6c4b38f7d6d5c4a205a3890
font_01_sfnt_off00011a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13273 17416 bytes
SHA-256: d5962ce6adb0194dc9b9e6a85cfb3c97202091740162bb8fd3b126dd1fe6bb01

Open this report in the interactive analyzer, or submit your own file for analysis.