Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3ec294487f6c80…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 17:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 095641a25fc26b522d32fa7153cf9f8c SHA-1: 88b11a7975561f1f05bf8bb90df98125dd4ff1a0 SHA-256: ff3ec294487f6c806bddb7b20e3fcf4b1a73f6713e9ced9e090e084e5d6038e3
172 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to trick users into downloading a secondary payload. The presence of these elements strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=save+as+pdf+outlook+missing PDF link annotation
    • http://fotostudiovaccari.it/userfiles/files/69376396469.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/45125706799.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/45363978677.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/88564678311.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/46138722350.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/92143718085.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610991b110afe---fivugupobipuxuzaw.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/42310402114.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd3b7aefc3---63842674935.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/844ddd65d93080f01d4117709377eed9/70974358002.pdfIn PDF document text
    • https://reniuved.it/file/47426844436.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/94810774837.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/vosejugosabe.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/mibajelez.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/529d5cebe770c9e70adb251a4c7cd2a8/ximuraxavilaw.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/sifemekulifuvop.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/80583421378.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5988ec7d9e---sizidaripivololo.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/kagugijofiripinezagik.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/1440248495.pdfIn PDF document text
    • http://stasta.com/userfiles/file/29391975199.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/psuf6tap2eviom9ed3tkm6h76k/79529473976.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098622f583cc---31667710836.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_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 17120 bytes
SHA-256: f23e8b8967f93273a791cb18b2369b39fc3ab292f43c5d9e53aec8f9a14a2c56
font_02_sfnt_off00012a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0A 11072 bytes
SHA-256: 122e5f2fcb30aab713388623049963593ecd2eef5e350262e6f9f7b515125bd3

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