Malicious PDF — malware analysis report

Static analysis result for SHA-256 9256cf8f375aea45…

MALICIOUS

PDF

86.8 KB Created: 2021-06-26 06:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 5bf8cb62f3bd7eb232499405478c7abc SHA-1: 68bd6b3efd0de89f6c3edceadbed10a43adf7308 SHA-256: 9256cf8f375aea45305601546b338b9a80ae903493624b0dc67fce996e8a1977
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads, such as 'http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3pkll98koptdghp9dul8hvfdv6/56846590612.pdf'. The presence of these links suggests an attempt to redirect users to potentially malicious content or phishing sites.

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://infrive.ru/uplcv?utm_term=how+to+unblock+blocked+calls+on+iphone PDF link annotation
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69756c54c320c31bd0badf40f74891b5/3551420150.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a808328f79e---80909335638.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/8dbtp7vn9igiectn3lhg2vmki1/44869316130.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/zizadudetu.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/zavosutajudival.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd630e7f03a---rafoweroferasa.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/246b54951b78c5bf8a8740a2e16e3c56/32318480109.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/bd357aaaef3cbc79955b92db5b03eae7/87784379452.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/2ef75f95f7abe28955b1069bffaaecac/xojovazonesedo.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e30db1303c---dilirubejobe.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/2f3a7271fd1d287d8246171df9ccf9d4/lugowadupa.pdfIn PDF document text
    • http://sivam.pl/files/file/xefadazebezafax.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609941a000316---959983286.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/a53d892a03914c52898f014025f33784/10515135916.pdfIn PDF document text
    • http://ahchala.com/img/file/sefijeviwuvagupetowedu.pdfIn PDF document text
    • https://alutat.com/data/file/tusakutopusaxigefoxovomo.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/penukububulidulitelelu.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/62179745487.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/b2bdd8716f9b0dc9a0187405e45a5924/sekasatapagagonovisafejoj.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/c368defe3d9330ec831130d375d5403a/lasijasasexosawak.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0psvvqfu3md4lqhjmep93vhf91/ronifoxaxugirudomup.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/sazisemegoduzefemozava.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebbe930430---fekakuj.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3pkll98koptdghp9dul8hvfdv6/56846590612.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/029de817811d849485f856f08a805968/xases.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_off0000f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 10920 bytes
SHA-256: 281bc5e0d56f9f0f5982eed4d90837cf38f80ea5896e9c0d0e8ae34190f7e6b9
font_01_sfnt_off00010909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10909 17160 bytes
SHA-256: b721b8e348ae7bf98e1402135377261fc4c700893330cfeca9f9978793665357
font_02_sfnt_off000135a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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