Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b1b106048c800e…

MALICIOUS

PDF

75.4 KB Created: 2021-07-12 17:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47b3c9bbc5393e5185482897c5dee942 SHA-1: 795975a9734468346a0a7e3ba70cc885ba843d4c SHA-256: d4b1b106048c800ee2be7ffada645b5bc09acca9c43d91c57266d575c38fe403
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites. These sites, in turn, host further PDF files, suggesting a multi-stage redirection or download process designed to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c705de9bf9---modaliwewanizetixujutadaz.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607951824d943---5060731849.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca40d8ee69---kuganajukafazisuresu.pdf
    • https://amrapalispot.com/userfiles/file/xekogi.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807c0933007---75311777093.pdf
    • http://norilskgu.ru/userfiles/file/xipizomiponowupajaxotar.pdf
    • https://sharjahcements.com/images/bulk_images/files/nutujetapa.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/cf988ada5e37daf8a6c256f0b0e85633/dibuwa.pdf
    • https://hssanesteban.cl/files/29664865878.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee532f03d1---xabarikusojo.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160864b7db6308---17705979768.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/m8sdu2sv1b2crf5uf1skkjq6pi/femiduvexipaminepe.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbccfb3822d---fowipupipomesijed.pdf
    • http://cncforginghammer.com/d/files/94738426160.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d7e0832f---94305748277.pdf
    • http://www.deopendeur.org/imgUser/file/wobaz.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078030abd599---fekijuwer.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde46c08693---fuzafu.pdf
    • http://labonguyenhoang.com/img-chamthi/files/83296330826.pdf
    • https://ekransamara.ru/files/najefome.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f16b35650---pukowusexizobidojolazupe.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ajs42vm1daqe050230a49463ou/xobeb.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/04da7f930edf307c851f44db34961e52/76045356784.pdf
    • https://nanyangtextile.com/userfiles/file/futugurupo.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b74bc0e8114---69561744276.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f45edf18d9---towewobesavaru.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a7b21af4c04d643e74ac62fd687cb686/46601376770.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=to+the+lighthouse+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3d1.bin
1a705a0de54b1a4a2a37a77d91424288c5730b039e2bf9862cc25e8e9cb4ae21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D1 16788 bytes
font_01_sfnt_off0000ef7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 16792 bytes
font_02_sfnt_off00010793.bin
a4419559fef7cd7330b16531c6ad1987669923b95090f2dc6a0199f4b50785f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 10828 bytes

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