Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde2e99c60750ad5…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 03:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fd9c919651f1d231c0b302b80434cf8e SHA-1: 1d7faa3de6d40165449601c4009017864c85c63c SHA-256: fde2e99c60750ad573f9ca9cfeec55637a90a48264799662a0dccf29671fad4c
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=stranger+chat+app+apk PDF link annotation
    • https://beysukonaklari.com/ckfinder/userfiles/files/93499025540.pdfIn PDF document text
    • http://mastervin.ru/files/file/78038686041.pdfIn PDF document text
    • http://ned.ru/uploads/files/zemiwipamofepuw.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/32868563105.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • http://cuboni.com/uploadfile/hong202109020913581825.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/podizuzilagipadonevano.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/88674988378.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c75aef342862661e8fcdd0a005ada21b/23378801885.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/45127335011.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/88194295503.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/77518373289.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/pilajo.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/20437694496.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1c9e80ad12da1dda55073884787b77ac/jozobobudezez.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/tewuzafenurusumumitopofuj.pdfIn PDF document text
    • https://paradigma.bg/uf/file/43535445671.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2109100728259749346v2zga.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/97426674752.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/65889230685.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/27057473394.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/79827760363.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/72284076300.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161325b6272189---nukomegefovetepipuwujut.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/mujenipemakeb.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/visomakokiwewire.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_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 10392 bytes
SHA-256: 139427fdfb60e29097d173c027d8c7edddffb6da516e22387b5e0f560d1150c4
font_01_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 16536 bytes
SHA-256: fb62fa4b86ea93db2d05b8ad956a0cb0f8513946b6b2f3ae59263bb2216ef757
font_02_sfnt_off00011aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1