Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f19c8d6f033cb81…

MALICIOUS

PDF

83.3 KB Created: 2021-06-28 09:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 2d941a8c49fa549b0c5e81b91fd174aa SHA-1: 89cd4e1ffcb2bc37e1bd7f6393de65225f85fad0 SHA-256: 5f19c8d6f033cb81131371b33d325f87bc4cd53f3f5e85804f39b29856b87c46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting it functions as a link farm to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=separating+pdf+pages+into+separate+files PDF link annotation
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098327217728---40392945616.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ce79d49de9f---veludabebedixugesutufet.pdfIn PDF document text
    • https://luminex.pl/upload/file/5641555154.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/37490258670.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945104204f0---41267434391.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/megugupozu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819dd96c8d0---dijeluzix.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/bibeviparu.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071442c17b40---wizokavotaworebedok.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/87679273847.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/zafigagagisekuvupob.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/45619140757.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/wodafikorejuxugapu.pdfIn PDF document text
    • http://toonesk.com/upload/24538121845.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd04ad777f---pejuvuwalowetofugitaso.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/womizapudekugifo.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/24729064189.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/bagajaw.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/99765719843.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35c069145d---woripeme.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a814152d200f482c70f0cc64eb3ec991/17932303631.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f331b378---42336566450.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/kuvurelebumijixiwaxid.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_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 10748 bytes
SHA-256: 5577c1ca9aae97609efd2dd46df343f131ba53cb4e0af6eb021790544cabe914
font_01_sfnt_off0000fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 16844 bytes
SHA-256: 34d1721e9f05824e315ce50a7072db652001b57060902c15f1bb97d3b3de891f
font_02_sfnt_off000127f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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