Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd94b271668f4ffc…

MALICIOUS

PDF

86.7 KB Created: 2021-06-30 00:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: aa5b9295191ffd0a8f06080025133fbf SHA-1: f185bad1d19d3857137f4edfad58d24e105d1844 SHA-256: cd94b271668f4ffc55485af40dd131d283b5ffee0200905723c31bf52ef6bc04
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm patterns, directing users to various domains, some of which are hosted on compromised CMS upload directories. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://jotekonybakterium.hu/userfiles/files/sinejafukik.pdf In PDF document text
    • http://ghalemdi.com/userfiles/file/69920303680.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6abaca3d630367691405e1be535b5c7b/26533139942.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/7hrg4epdvlt7ub5kqpv2g64f4f/61494647527.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/jetaguki.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607830f7de7d7---lirodenobukilume.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/vivevenusodapemotelovewet.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/d88a6023c972c1b90a21d3484ba3c766/gadus.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/84116229825.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/e52ae1acced4a31ebebeea8f484b09e7/sapowatafesoxovarukefok.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/gelugulupolamefefokep.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d46fc587e7---12539838438.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/wuvig.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/revabivekifetul.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160cdacf45dfc6---55067369660.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/vitajisogimitavotolavijo.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/lolegesus.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/52581307454.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16220027240746.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/33922748082.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd42eb5348d---65067196052.pdfIn PDF document text
    • http://armanetti.com/images/9241720479.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094095001e3c---95835995005.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/11751708125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pelican+reef+hampstead+nc+homes+for+salePDF 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_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 17072 bytes
SHA-256: cfdd182c39bd31fd6b39003a2f7e6f41e0030761946b917d1c9144d93b67cd95
font_01_sfnt_off00011c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C63 10888 bytes
SHA-256: 8eb7a879555366549e4099d037089809f08834e898c6923e3bdfc06ff1aac7a9
font_02_sfnt_off00013558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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