Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff1a23eee289cbf…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 14:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df7910dde86c9328d7e994dcfb7e74d8 SHA-1: 561f2b7a41c041b7723715f2c643dd76683a2f3c SHA-256: fff1a23eee289cbfc42e45f5c12ef2688c01831c51e2b01fe38e6c07885e584e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating the presence of random and compromised CMS upload links. These links likely lead to further malicious content or phishing sites. The PDF structure itself appears to be a link farm designed to redirect users to various external domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=surah+yusuf+pdf+urdu PDF link annotation
    • http://champagne-marc-chauvet.com/images/files/bonak.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/xizukigerugemix.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/27778553678.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbada3464e2---gomipufuwama.pdfIn PDF document text
    • http://eichler-kammerer.de/nimiwasa.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/96546699360.pdfIn PDF document text
    • http://skupka54.ru/upload/m/vafivezukaxasunetaveduvus.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/3a0a1e11459ec33f3ab6d2bedfdb8134/63173644313.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/tixefowoz.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/25074182726.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7357279d7a---37018744159.pdfIn PDF document text
    • http://dzbnf.com/upload/file///tafowutewimijizul.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/9136535113.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d00b0fc21cd---59411750255.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f8b2aa0299fd2131ce5746853cbccde/72871369813.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/2c101bc077d580b255f47ad2b20d2cf9/kopijifujunize.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/mastf7th8pcgp908hmkiededj1/55278898286.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/somoxubifoxinirow.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/naxexegaroriw.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/bezekizomuxevarofuw.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/dopufifuxowigunuximi.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/xixukotomaxi.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/13664838103.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/3v1n4hu4kdl7t60hgvof9pmgr4/vafakazefemeb.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_off0000c8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BD 18096 bytes
SHA-256: 7fcd6be271d732b8e1afde1528ff84c6a3a4048531d7c62bf3567303ee9e8fc8
font_01_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA5 10292 bytes
SHA-256: 88a00cdb0a8b4eede118e22f9d42ebfb35cbf40b4bfb31f2fb9494c1187bc6fe

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