Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ddf08bfda257dae…

MALICIOUS

PDF

91.0 KB Created: 2021-06-27 16:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3bb58e77f5b59b0c11a1dec40d40182 SHA-1: 84ffd8c1661c0fb850900c4689aa6354c0cbb44d SHA-256: 9ddf08bfda257daeeb317f52c9c5e1b008a688b75d27e100e22cc00b8675cf64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous external URLs, many hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The structure suggests the document's primary purpose is to redirect users to other sites, which could host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://shreyaghoshal.com/konadnew/userfiles/file/mubibajisutugonub.pdf
    • https://alihuata.com/userfiles/file/66624498550.pdf
    • http://bensonlandscape.com/editorData/file/redatelatoxawoz.pdf
    • https://nevisnews.com/userfiles/tekobirowusugitezedel.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rs3do4dbvtlhl7aqfvom9rfge7/tegufedigitom.pdf
    • https://seeandhearbetter.ie/img/shop//contents/72723722218.pdf
    • https://leosservices.com/userfiles/file/84228724401.pdf
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/86322050103.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/1628857088.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/5c4159ffded8c2dda67dc72e77942ecb/17037479290.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-24/20210624044934789664.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc08139e2a9---17326267119.pdf
    • http://waypl.pl/upload/File/5836901580.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/vekoruvinesazefugen.pdf
    • http://palyavalaszto.hu/teszt/upload/file/12781721658.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fd537db1f---pojumo.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/n0r2o897qgv386c1ci7upb4qu0/44949924896.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/7f472327c92400dc686d00e76a241be9/48691437401.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073e99c42fa7---889809666.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16082f025e10a9---xamasinomawezofegiwun.pdf
    • https://fertilizerproductionprocess.com/d/files/fekurudiwirojedu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=riding+the+waves+of+culture+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_off0000fedb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 16792 bytes
font_01_sfnt_off000116ed.bin
55e978ef97454bae2a2c0ae0fa38e7e4ff3f182bf7d44423a1344e4949ba6405
pdf-font-stream PDF embedded font (sfnt) at offset 0x116ED 17672 bytes
font_02_sfnt_off00014509.bin
400ccfa60e7d63ad595cef575092e81a0365a6cfda34c3b126af4927d204e5ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x14509 11196 bytes