Malicious PDF — malware analysis report

Static analysis result for SHA-256 f246b795f9e07c4f…

MALICIOUS

PDF

74.5 KB Created: 2021-07-27 22:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cbaff23f7dc11b82ece7b5dbf72a5a9 SHA-1: a348542d65d4325bcd46d308f07c450d37918005 SHA-256: f246b795f9e07c4f1e4665a716a85bf924234142d9dd783f96f5c6e27b44dd4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://vds-construct.pl/userfiles/file/potizulaz.pdf
    • http://myexamadvisor.com/fck_uploads/files/72414460462.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbde3f0ddb---palogagavomesixof.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160712f4c4c70c---69776435661.pdf
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/wugelodabaxi.pdf
    • http://clingac.com/d/files/zudurawawodaredudebeloko.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcfef83648---86353587542.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/h9ej1q1mv70h2g62jltsououk2/64977413345.pdf
    • http://chickendaylacrescenta.com/uploads/files/xudafimomoriwivivinige.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/t81ocm2f3cmujcba51nc3on6p3/sejitamaduniv.pdf
    • http://carshopm.com/js/upload/files/wirenidefogixiruz.pdf
    • https://eqonetech.com/upload/userfiles/files/6070441708.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa1d24117---10774845895.pdf
    • http://lactopad.com/uploads/files/kudogobuxa.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50d2ca2e0c---silupunumer.pdf
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/9b78a78a93b7016552ae2f83d7b9a448/ruwerifazinitutejobepezu.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/a45848c95b9e0243ff13a8b8d34bfa9d/2797445387.pdf
    • https://alakharia.com/public_html/userfiles/file/97504647710.pdf
    • http://henca.com/files/details/file/38136369175.pdf
    • http://europavloeren.nl/siteimages/file/tixiworokarorirawunopamo.pdf
    • http://aardbeienfeesten.nl/uploadimages/files/livowo.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079e0f3c82e3---lomexuxefopusogeduriroj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+email+paperwork
    • 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_off0000c1ed.bin
a7172e83d276e792bd1823b2eeaf8ae8ec728f61b45231898ddab78b4f25694e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1ED 10312 bytes
font_01_sfnt_off0000d928.bin
917bb9f591ba66bd1dc168fc5f070a51fc2ede2715101fcc56e3d92b930d02e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 16512 bytes
font_02_sfnt_off0001040f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1040F 16792 bytes