Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a37ae84f45142a…

MALICIOUS

PDF

88.7 KB Created: 2021-06-30 09:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 0f2e7d875556a45e69414b1791a551d9 SHA-1: 871512ffa3c691fe91882ef9c611a4a2d575f6c7 SHA-256: 39a37ae84f45142a8e974df6dd0950c564d78a6555da6b28fab2f8fc4176deed
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 external URLs, many hosted on compromised WordPress sites or disposable domains. This pattern is commonly used for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://chcial.ru/uplcv?utm_term=winter+whisky+sour PDF link annotation
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc83a90811---61781578507.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/aa333adc4bad130885aa854cdbecebb7/jasorozinidoveloge.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/nonemilomomadom.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e42273e5c---55348038738.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/49729040516.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ui7otj61v2u48rh469svactcv6/rufuvex.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e630a4fc52ed355ccb8d627367ab1175/42337516937.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a8fdaf9863d35014da936fc215fb5154/vifiw.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/zavajowofukirukaloxanupe.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/181ffee3454794479f35b922fd1b1350/89862405980.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/adc82c73499f75a0c70964a39ea71466/74359993882.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607984749c1f0---42267157868.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/9cq5t9ke1hdamur7jrho4hg3vk/73444847713.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087449497d2e---91751399488.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/kewavilumub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609028c398594---sodamofoburodo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca76b8d2e6---mizupe.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb320209a0e---56315182896.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/45723425630.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/sigoxegesejatepul.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/guropeguda.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/86281335648.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075366c4ac06---zeximomunefululov.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_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 10380 bytes
SHA-256: 043ad1abe319d9811ade2cead0fbb0cb7df8d82dc3dd09c9ec670628b343c83c
font_01_sfnt_off00010e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 18024 bytes
SHA-256: fd794c8d9524ea234dc662d3989ae3fa8058b4fe111958469e9201f40c3531c8
font_02_sfnt_off00013def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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