Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcd5e82de782286…

MALICIOUS

PDF

82.7 KB Created: 2021-10-06 07:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f2b436915fb4526b84a398afbdda2b30 SHA-1: c9717e1a6f8d05f3242d83ea7422391146d0c196 SHA-256: 0fcd5e82de782286c65ce0fa01a1b3036ab4a49ecba2421635b1a3caece3934f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=quotation+about+self+improvement PDF link annotation
    • http://artgraf24.pl/userfiles/file/lilazofodanegizimeluwoli.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/xupofojujupik.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ce53a592a8---11235799775.pdfIn PDF document text
    • http://indemo.pl/Image/files/risisorifidigoxafiku.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bobarobixifisovo.pdfIn PDF document text
    • http://kustari.net/userfiles/file/95499001169.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109161743222388.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/25502113520.pdfIn PDF document text
    • http://bastola.org/userfiles/file/vebedo.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/17170366502.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/70752388015.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/13020254990.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613aecb6280bf---zimirewenopigagogu.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/28463991436.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/22267057503.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/vutel.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/42333051280.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/95733449642.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/rckfl2jfhg7b02jblofqigl9i9/bujax.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/46552994959.pdfIn PDF document text
    • https://fishuntpesca.it/file/55086399884.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/73164129869.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/kilabemedowapelupivewa.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_off0000da57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 19232 bytes
SHA-256: bfe9a4a3ae1bbbfc129c03c7c40a3149261be26c9af4e08058ffc7679e51d0d9
font_02_sfnt_off000123b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B7 10884 bytes
SHA-256: 0b866f427b481faeef423abe6748cc883679c4af2e8c07dd800d9e4dfe23b25d