Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52fcf473281e625…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 03:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 158e5b40958449d45e123a1d8db654c3 SHA-1: 15202175ea5b28580776a2bdd81ee9a7ca9cb7c8 SHA-256: f52fcf473281e6256ee56b469af4310958e4963c2a951083955cb95985432315
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for executing malicious actions or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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.
  • 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://garglob.ru/uplcv?utm_term=gta+5+psp+android+zip+download PDF link annotation
    • http://changwontour.kr/FileData/ckfinder/files/20210910_A94C8F478D12FFBB.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/68945450163.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/71119180083.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6eab8ef1f---72458732938.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/mixunin.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/matizifisapovaduxos.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/vopejimorabixevopivo.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/lajemasafawifopafumujixod.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/tozixizozuf.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/zebunabubodobamepi.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/58378969063.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/55520720757.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qp0hhaq73pogj923g56s923s8m/rizexonowitu.pdfIn PDF document text
    • http://hasyo.net/files/file/63167453363.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614d18b8bdf32---22122563838.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/20841243525.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/75066345101.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/32496692506.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/5782938228.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/56869642976.pdfIn PDF document text
    • https://birotex.rs/images/files/35808309051.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_off0000ad48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD48 17260 bytes
SHA-256: 1973a5a70189d061fe90c33f1e0317ca86b538e7ffb3ad1d247060441304d7aa
font_01_sfnt_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 10572 bytes
SHA-256: c9235bfbe2cd8b33ce0a9d9b1a045ca31ef19450f497dcebc783a8f623ed7a95
font_02_sfnt_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1