Malicious PDF — malware analysis report

Static analysis result for SHA-256 f059eabf9f4cedba…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 22:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0531fb9aea0335ecf14b1acfdf269e3 SHA-1: 768306828da7bea86177bdc8630bd52f35c6fd5e SHA-256: f059eabf9f4cedba5f0a03aa8384440e17927dd07dca48155ef242436d948830
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely to distribute further payloads or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://queure.ru/uplcv?utm_term=change+emoji+gender+android PDF link annotation
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/tilorikopuwuzozuxitov.pdfIn PDF document text
    • https://felicityokolo.com/file/61349807080.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/xizakiwujalakirolol.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/rubixezixo.pdfIn PDF document text
    • http://momsystem.ru/public/file/59401176002.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/33338646196.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/sefonopusolowikifaj.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/kodukokofofulesapukow.pdfIn PDF document text
    • http://millecolori.it/images/file/79544172912.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/76089750526.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vegotogegu.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/75485564501.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/78859167279.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210918_035601.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614321692cb0d---pupefepopejut.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/rimebagol.pdfIn PDF document text
    • http://viorina-deko.com/images/file/81950679078.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/58826585901.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/gixujewogol.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/9bc8c6445d1e7a6eee2e9199a5fcd069/dorafadipowil.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/midurobobawerel.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614298806e919---76376130620.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/95546786661.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/13515237815.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/mujudajosageduke.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_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 19712 bytes
SHA-256: 9422839580e9de568dd645bdeeb72b2deb6beea362a3a621eaa2d99e78f3203e
font_01_sfnt_off00011241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11241 10544 bytes
SHA-256: 5438d29da7217ebf6c43c566560e3dc00763423fd4612eeab53471f8dcc1ab2a
font_02_sfnt_off000129c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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