Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0e74f478378de9…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 09:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a1461ccb44ab915de0177e75597aeb5f SHA-1: dc92ae0989e7ecfa4690c6948ac9710c99708453 SHA-256: 2f0e74f478378de9b575280d57152d5577940c35a4e13837d415488ff4036557
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on various domains, many of which appear to be disposable or compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests an attempt to lure users into downloading or accessing malicious content from these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://maria-galland.ru/files/file/84821425770.pdf In PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/vitomidesigodat.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/855bd00cd35609d5e73b6f386fe9d5a1/furekobaze.pdfIn PDF document text
    • http://hongdacable.com/d/files/49612882861.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/9602679399.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/57286579635.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb6c9effdf---45964497763.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/11116537073.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/wetoluromatopexawejej.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94eb9c033---48454670312.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16116b16929364---65477228421.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/2448743174.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f3fabeda8ac31388c7d866d38de447d8/tokawivujukiwidim.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b431b0aa193---24494013529.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/52624917645.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202108052203107005.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/kolukemi.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/wafiwaxapanademivepipewo.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/nefolilizabikimojupeg.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132daae13ea5---birosajo.pdfIn PDF document text
    • http://dgjst.com/upfile/file/46907168288.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160e044d95368a---senoxitopufak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ionic+bonding+worksheet+tesPDF link annotation
    • 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_off0000d41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41E 10708 bytes
SHA-256: 9fa6156a1b3e13b7582f60e635e2bcc890817709b1ab7c92f72aebafbeac086b
font_01_sfnt_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 17184 bytes
SHA-256: 68f0a609ea414be96577a6fef99be1ce19a0ac78660a5dfe68caf274c1f82de1
font_02_sfnt_off00011905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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