Malicious PDF — malware analysis report

Static analysis result for SHA-256 53824c02cfd500e8…

MALICIOUS

PDF

145.7 KB Created: 2021-07-14 02:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 937465e7f45fa8d75b43645927859b9d SHA-1: bd6b9f33226ed22b4f4b4f6d0ed363f0fb3224b5 SHA-256: 53824c02cfd500e896443a13c7788f56523db7a8373278240405ad79f7acbfc7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous unknown PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable due to encoding issues, but the presence of multiple links to potentially malicious content is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d1e8c1c4db7af8b028c6c72d58b40296/68236685791.pdf In PDF document text
    • https://kar360.com/resimler/files/29817950173.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/4f6f5bb08044b634e3d78db0664b433c/77436391826.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1khru86uglp78qe8aa0o95e4n6/siwepunupoj.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160abba20a91fa---74586629417.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/vusog.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/48116407141.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160edd36a8f24f---kabaf.pdfIn PDF document text
    • https://aedwea.com/upload/foto/7718046151.pdfIn PDF document text
    • http://iwishop.hu/file/ledujofuwa.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/papilum.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/dodaritubi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759af01d19f---wejotenabi.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/e32c0398549b0ee1e92c5a528376c931/110456561.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/xofuluwosuxorelimidubofis.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e0322cbf---96812378597.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9tssoq0n4ic6cbqbgsd2e8f5q4/daxipakajamadumakajozepi.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb776d81d7---81850884096.pdfIn PDF document text
    • http://protok.pro/upload/files/90434681377.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f10e140b---26134219385.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/gawuxiketezujevalatuxo.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/zaxugefiv.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/bidonobexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ancient+greek+empire+mapPDF 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_off0001ca24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA24 10456 bytes
SHA-256: 6286eee44705d7ece900cf64716eb6ab6d90016aee70cb004c08bec74f636e9f
font_01_sfnt_off0001e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9FD 26080 bytes
SHA-256: 0909341f10c0e2c413e2c23d84fe577e8ca97029f853afbd36218ef09c161486

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