Malicious PDF — malware analysis report

Static analysis result for SHA-256 118682194b04a9a6…

MALICIOUS

PDF

82.8 KB Created: 2021-07-27 03:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a1d34b1be84a9610bf5bf8e7dd86517 SHA-1: c83b83d77f6b5071815331ac0436603a2f57928f SHA-256: 118682194b04a9a6cfebae0d9901dc893e133e015c4b67b2d43760db3965d316
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, pointing to multiple compromised WordPress sites and potentially disposable hosting. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c89a4d4973---xedutufojikazagivugubiwal.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0099a27b0---3590781235.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/49743984381.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079277e44e78---wuvuvoxetu.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a592b45816b---29050305527.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/b8d91e24df314c8ecbe99437e1da3a47/62789049445.pdf
    • http://gorisum.net/fckeditor/upload_file/file/83660522729.pdf
    • http://mevlanaasm.com/resimler/files/30626403302.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e662a4d17b---nukemanuxaloterejagu.pdf
    • https://al-wesam.com/userfiles/files/nuzizobevuros.pdf
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/67924841021.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/lcrtj5mncqbv54iar3d28m49gc/72063932596.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/04484ae48330a10bb193744dd74d8af7/javiwewapasez.pdf
    • http://jan-fotografie.nl/upload/files/50509030044.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/jpm4n1fhmvchv6lilot7ur1gsg/18367759377.pdf
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/kidalasare.pdf
    • https://betenrealestate.com/sites/default/files/file/piminejivalek.pdf
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/98431134683.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/14082728772.pdf
    • http://monkey-do.net/userfiles/file/rafidure.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ebsbkohi1g5kdjeodr5f32vu0p/13634974410.pdf
    • https://southwestlooms.com/admin/userfiles/files/31856630694.pdf
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/29057777359.pdf
    • http://vantaibactrungnam.vn/upload/files/72852920448.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+last+wish+introducing+the+witcher+hardcover
    • 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_off0000df2b.bin
2a80d9f853fa8d86382231bf55e6db78291c77942541666f2e2c77adcadb850a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 10864 bytes
font_01_sfnt_off0000f81b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 16792 bytes
font_02_sfnt_off0001102d.bin
9865ff76f2ecefbf3413d5fa280ff5942dc3ce6f2e00d23c7bf4a470d862baff
pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 17156 bytes