Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab698df7d84e643e…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 13:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c034db6f599af96112f7b78fa06d585f SHA-1: 1bb9b3c57a1d80a025b41f51c85da564158416d0 SHA-256: ab698df7d84e643e51fc0f2644daa4575700d979e0420265482173d1706df1be
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are structured as a link farm on disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect users to potentially harmful sites. No scripts were extracted, but the document's structure and URL distribution indicate a likely phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://crysiq.ru/uplcv?utm_term=current+affairs+of+pakistan+mcqs+with+answers+pdf+2019 PDF link annotation
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/15fckb5q49sd0o3suq8ci92pud/towawujogapetipomusunodu.pdfIn PDF document text
    • http://vtaky.sk/media/file/250036562.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/kebofadipelebagudebuvosan.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/136599186860d32e064329d.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/bikedik.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/70952604612.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/30518432763.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87bc1dedda---93392859201.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/02375g44tsmjcqhon8ns3keoh8/96700157262.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/bulaxo.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/28443417985.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210702174041.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/59241902648.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a8a58ac83---83982698606.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad6146f8ae---31383852906.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/xiwuzorevafeso.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/405069570.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/90825490490.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb995f37b6---95393937706.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/timosorogepa.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nenuxarewik.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5adf30ecf65a47cda26e2a639dcf675b/jaraxukuv.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/1651244698.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/togajifikuzenuwasef.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/bumipemalenoletemixebedim.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_off0000be14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE14 16772 bytes
SHA-256: bc7ed39330f683e1453b59d151379a21db18faef842ceeb679acb4678e0782a2
font_01_sfnt_off0000e93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10151 11756 bytes
SHA-256: 844700621176c2181e629af22f4a6ba5735fe7317dac13d6c6230f9da72c7005