Malicious PDF — malware analysis report

Static analysis result for SHA-256 637fd295556a2992…

MALICIOUS

PDF

92.2 KB Created: 2021-09-03 18:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d685599411d5e3fc6c02208a360340b7 SHA-1: 4b6ac1b6fe71f34d3a3f5c13384f23f49cfc3884 SHA-256: 637fd295556a299288114e3e2389572711e0df1e9641fcfd3dc82759bc57e411
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or scam campaign. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute further malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to trick users into visiting malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/3m2eu58kvcbe95gmrogtmj0b0u/58582734998.pdf In PDF document text
    • http://anatolianlgs.com/userfiles/file/58147663656.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608103cf17164---noxapovowelumubobural.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5e708074baad0c90e4e2a233e7fdb0b3/nezanimuzufenujazunegaka.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fac3ba31d0---bexijuxapujemuz.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/cfve4q1pbb0qatv845at33ook6/84263632463.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/6a3dfaddfc3100cd32b5b2b68ef50c7d/95877433010.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/23721180926.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/9166906758.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb04dbebc84---degelabanapuzokowozinef.pdfIn PDF document text
    • http://mamam.by/upload/File/file/xinopukalukejufafezinina.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/47295824180.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099e9aa34d7c---mesanozupobebezunamit.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e34691f0d---jenal.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210816_B60D65770EBDC79D.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-8-15/20210815193443301919.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202108191156386841.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/gefapodenetivixunu.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/vidojusurufunowexe.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/77829444915.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/gasidikera.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/72286918456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=agriculture+extension+pdfPDF 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_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 10816 bytes
SHA-256: a75d9996378d60c805129fbd8abeefbdbadae5bb580ac5e7755892015d018fa1
font_01_sfnt_off000121a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B8 16256 bytes
SHA-256: b6fb3b3bb76b5da33ae56b1a77222f78bdd065c9a35a49338d83d51c3a02f74e

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