Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c1c3aba00e24b2…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 21:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8bffcff7c3917344a7ca663246f2f82 SHA-1: abe072ab63fc65161dbeaea60814b360a049a20e SHA-256: 94c1c3aba00e24b2f9d709341c864c85114cd52cc8ba8af4006017630ea1fbc0
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, some hosted on compromised CMS upload storage and others forming link farms on disposable hosting, strongly suggests a malicious intent to redirect users to potentially harmful content. The 'SE_DOWNLOAD_BUTTON' heuristic further indicates a lure to trick users into downloading something malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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 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.
  • 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://huntic.ru/uplcv?utm_term=best+free+streaming+apk PDF link annotation
    • http://przedszkolenisko.pl/userfiles/file/6838976077.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6f1c7b1f833e576b216d583a28d1df6b/xiturobusuvefedalak.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109070322037156.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95741115715.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/80017193517.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/wesijixabaxizerojat.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/87938925848.pdfIn PDF document text
    • https://jobtiara.com/files/files/18984198465.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/loxogut.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/fotaxuzimotiduba.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/bakabudi.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/76589190531.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/22650666018.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/77256097911.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/bipiguwevupada.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/disotuxibisujoxoxejuzam.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nusesuwaxinok.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/losojowosisiv.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5277aa5a4---delisesukovafasosuduba.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/032bb6022462e5e3347638091f70432c/62737418742.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/41925272784.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/povorevuzobaxabiw.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/zepidarovonezavabusafepe.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210901_0D3B0210CC65CC8E.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_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 10680 bytes
SHA-256: cee62cf204965e1b1077fe4805d50535896163d6e5540c92bd30b39101bb34b9
font_01_sfnt_off0000f5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 19080 bytes
SHA-256: 68f75c8800f421602c0b6079770c394dd63326bc5d4dd46632f9ab9f222811e4