Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ecf3aef2a1bb9b…

MALICIOUS

PDF

82.1 KB Created: 2021-07-06 09:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c79c58a51d2e4422c36e2cab1e70267e SHA-1: 0d4301de7068b93a8fb7ae734bf155ca637aa25b SHA-256: 76ecf3aef2a1bb9baa53c04d6f9287d71db5e261be6cadd50c762e6d91e81bec
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other domains. These links likely serve as a distribution point for further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crysiq.ru/uplcv?utm_term=got+sidetracked+meaning PDF link annotation
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/lvoidani4o87p2jmqis6u1qmfl/59548850618.pdfIn PDF document text
    • http://22743333.com/userfiles/files/2949293016.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a54ea47962c---99809602098.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/nurus.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-16/20210516165718376720.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16095b636dc593---besudomugilibufufo.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/9fkofbbtchqlp0ch0me37vk5oh/79615065575.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/13265375751.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/remug.pdfIn PDF document text
    • https://herfection.tw/upload/ckfinder_temp/files/20210622200557.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16097ba867ec06---39588645178.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/23502379761.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/aac818ad942ef1eb9e9177a17a7f8ecc/21463051339.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ad9500c7db20029d506c61584fb0ca7c/mimenom.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/l33p52uicdjae9jgrohoju44un/80096771931.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607935fd7b494---20155303184.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/bijekopovox.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b636ebd8291---radotadabijobirabiwejiw.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23936164cb---volujijosibux.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/9meustjecrbssu038l2c38624q/78954363577.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/nerifibivikefiweze.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/lufagixova.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a453b624404.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/zirowagepuzilofigotijut.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/93917377555.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/36220265721.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_off0000da3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 17792 bytes
SHA-256: 506c9121e6534f75f2da472df725cee89a1fcf6d86a12600f7ef70885a47d5d0
font_01_sfnt_off000108d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 10800 bytes
SHA-256: e3f51bc65d64e6b4e38383e8a8ca7053226d831c53e88c5f86c750b96ec4abb2
font_02_sfnt_off0001218b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1