Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f658080aae37d93…

MALICIOUS

PDF

90.2 KB Created: 2021-06-25 12:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d2089128d6860c3698b234097c020d1 SHA-1: b4654cd0d1cd4a80cbb70980cfed3a1955566924 SHA-256: 3f658080aae37d93f2db13318eb47b87e0bfe2be31f159870e01e0c2aa2af22b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cructi.ru/uplcv?utm_term=clinical+skills+for+pharmacists+pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c3b8dbb0839cc6cc6651204f70545f1c/toparibewitaduvuz.pdf
    • http://archinfo.ru/uploads/file/2376768769.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8586b9c14f854d4b4cc3c83d21e1e795/67793694841.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13bada73df---fanugazanivasuv.pdf
    • http://delve-cr.com/uploads/74631789788.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734516b639b---47645320768.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb370544967---kesugimijeveteku.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855e595697f---44613033238.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a90f3622---puzubufiminexagukatidede.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8fa84822c---pivowanoxuwobolipafom.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c364ccf0c---8717327236.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2347d36d50---76637080407.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/kegetexi.pdf
    • https://fwullong.com/upfiles/editor/files/bumineketaxa.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_off0000fcf9.bin
c8ac6acf1711eecf402f7ca708b431fc57cbfb3f078613ea9ac354360d3305f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 17632 bytes
font_01_sfnt_off00012b5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5D 16792 bytes
font_02_sfnt_off00014374.bin
2ac034711cf0a234acc83c4122270d3fb2ad8aa047194e3206f20d9686d03db1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14374 10876 bytes

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