Malicious PDF — malware analysis report

Static analysis result for SHA-256 e439110e2c537f4c…

MALICIOUS

PDF

93.0 KB Created: 2021-07-02 19:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 874d95343c8b11e2da0b1b9b8afbf37e SHA-1: b7da2edfc420c101e611f4636ebb0fe7002c2f01 SHA-256: e439110e2c537f4c7b2dc07ac5a3d44ca2684bb76a2c50bb223f1456c5848f05
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=how+to+mend+a+pickaxe+with+mending PDF link annotation
    • http://hsi-international.com/ckfinder/userfiles/files/pizejo.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51612313174.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/wubopuxevajugufa.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/95196290941.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/d37fc3e54def856dc8b610c5e5c65d8f/taxugigikatufasafibokeg.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a10a9c33ab7c0eb6597dd8b32f3d520e/piluvetujaw.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e335fc0fb6---83802832960.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/234c91c7c9ab055384395c6396e99918/goxelokepazo.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb637f27039---dalukuwavafujepukomapadan.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/575bac4b16f0c791adadb0f19cf428bd/favavenulabi.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/xopinoduwam.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c460c14f4d9---pinuxadazem.pdfIn PDF document text
    • http://npas.ru/pic/file/49884989942.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/efaca6c255e1d92543a474dedc5d85fb/rojokavegewis.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zusufajesedirakumoxugi.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/lfgp9efmtj6vne8oiek7m51uq6/72021908861.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c48542cf5a64889e36e355a2739e58ce/sevijegixevizomaxakikotul.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1811630c9---xofawemegiri.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/f4373384388bb8e28a17b239efa72ab6/15032437865.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58e454e39c---11590663627.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-20/20210520150841829675.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/4649980597.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a29dc6f55---zowopuvofujuwejabam.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/07df840106bfe6c3b2c8d007459ebd18/sedojedidusabukaxuzirese.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_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 18560 bytes
SHA-256: ce529d5d7d1ff4815ce207bb5638ef82e036c7e18a1f9670891c2203f7fd8aa9
font_01_sfnt_off00013577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8E 10920 bytes
SHA-256: 5e658b821c782efb50dd101193dd1d92e3dbfcf7ca995fc3b5b7c045a479e823

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