Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f085338a05b6705…

MALICIOUS

PDF

98.7 KB Created: 2021-09-18 12:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be8d1fe2571789a0f71d65281d5f02f8 SHA-1: 21f4ce4705a593cfc9ca066538edd385e33c6269 SHA-256: 2f085338a05b67050b5237436fe16dcba7b6c3b86cdb01c0937010e6c04b949d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics indicates an attempt to direct users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://irlanc.ru/uplcv?utm_term=new+123movies+link
    • http://studiotecnicomancini.eu/userfiles/files/fowuvatitulorejufedu.pdf
    • https://masukpt1.com/contents/files/54983393815.pdf
    • https://cplastik.cz/data/cms/file/linisalokudekojirun.pdf
    • http://bisenzia.it/userfiles/files/16975267517.pdf
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/67341592273.pdf
    • http://rubensova16.cz/files/file/temivutaxom.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c103d4094d---fatotidevadenebabazuride.pdf
    • http://mexxeopaint.com/upload/files/96735019527.pdf
    • http://rw-hse-businessconsulting.de/userfiles/file/50137902355.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/84480856198.pdf
    • http://elmbbq.com/uploads/files/sozogaxagebijerewuleju.pdf
    • https://legend-chang.com/UserFiles/files/zemolejejuguwavas.pdf
    • https://www.opsclown.it/ckfinder/userfiles/files/46236426136.pdf
    • http://purepoem.com/resource/docContentImg/file/2021-09-16/fbae2f673bd102dc7b02510d864716d0.pdf
    • http://gagutp.com/sa_upload/userfiles/file/20210906145809.pdf
    • http://www.vljainandco.com/userfiles/files/mevasuwesupibezewotebama.pdf
    • http://www.tractortools.cz/ckfinder/userfiles/files/dizotiludoridekutololevu.pdf
    • https://xn--b8qxb801j.tw/upload/files/9172272334.pdf
    • http://ei-windykacja.pl/upload/file/gisaxiridilopudirivu.pdf
    • https://kenadong.com/contents/files/42456681644.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613666551793b---tugamerebiguduzodage.pdf
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/xogodegukitulex.pdf
    • https://corpus.bg/files/fck/file/11554601269.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b73538df6---xogedoxogi.pdf
    • https://itchanoi.vn/uploads/news_file/zepenonogimazabazuxo.pdf
    • https://hotelangela.hu/userfiles/file/93345635119.pdf
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/namapemuxazejowajidaseb.pdf
    • 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_off00011989.bin
ee59af2cab56dc2176992ccfacaa2d535d89ca05747adab25e126829051dafe4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 10476 bytes
font_01_sfnt_off00013177.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13177 16792 bytes
font_02_sfnt_off00014989.bin
a627897ce07e098650fb471fbce2ad5c43c316a16fbc8c327aef91f0a9638f23
pdf-font-stream PDF embedded font (sfnt) at offset 0x14989 19780 bytes