Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ab080c5bc43857…

MALICIOUS

PDF

101.4 KB Created: 2021-07-09 22:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b7130a3f335658862eedadda62aab63 SHA-1: fc24dd5b688dcb54818ecdbfc2d697bf51cfc930 SHA-256: 40ab080c5bc43857339a2beb7101173617d176cd3d5690b8457579a43406cdbe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, employing a link farm strategy to redirect users to other malicious PDF documents. The presence of multiple links pointing to compromised WordPress sites and disposable domains, as indicated by heuristics like PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, strongly suggests an attempt to distribute further malware or phishing content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://degrossier.nl/uploads/file/82940962036.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7be2b86f82b8191e6b9846f6dbeed4f/23345327541.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/li225o4jbj0o9nb79hk9hfna6f/jezenevizuwasaras.pdf
    • https://limsurdua.com/contents//files/rinow.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae37c1b0885---rilegitowegede.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/s37ngodhboobdkpi7sfchbebqi/fanusugetufugesivese.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e232ba75c---82184341317.pdf
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/39850754623.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69145984571.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080aeea327dc---55261650110.pdf
    • http://gallery4walls.com/upload/editer/file/43696067049.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/0hoimes2s89piql6pa6dhkumne/52284362066.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f0c882221---41321290875.pdf
    • https://learn-atdi.com/uploads/files/dotoxakebojukoxoful.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b7f08691---gizogadomifogopi.pdf
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/nasedadazunufesivebij.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac97037b69---mewum.pdf
    • http://absigorta.com/E/file/nusuzupu.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/3730106d4ef216ad8a08507a95af3db9/xewinezudumigobiz.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/glu4adikoa444eern8942tulao/39373586440.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fea0ce252f---sokafides.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/802302c8e5ee9f2f38e2f82676400650/girexo.pdf
    • https://callalilyvn.com/upload/files/tebukabanibug.pdf
    • http://accessprecision.com/userfiles/file/38914641858.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+do+yes+no+tarot
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101eb.bin
d16022ae646cf9e5e6876051b75c65aab38a8bce125d03ed85ca2450a235b522		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 2472 bytes
font_01_sfnt_off00010cb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 16792 bytes
font_02_sfnt_off000124c1.bin
fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124C1 16244 bytes
font_03_sfnt_off00013aab.bin
6ed8dcdd878abcb3436577fdb429ab35e1258355cc9f909c88de02db9f3c2c21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAB 22100 bytes
font_04_sfnt_off00016e8b.bin
fc4aa6e04ad215ff96966f01ae743d442858c45708e6f09fef18c81c105d07c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E8B 10292 bytes

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