Malicious PDF — malware analysis report

Static analysis result for SHA-256 665c61ba9944c4ba…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 11:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: feab9b12cc74f6e1804d56ea12178586 SHA-1: 73ced36a568774e1684851d3d70e3b2634ce8071 SHA-256: 665c61ba9944c4ba7a4a1c32704f82abe0bd87f5505fc10eb055060a9b34d53d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and link farm characteristics are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://medvor.ru/uplcv?utm_term=promotion+strategies+in+marketing+pdf PDF link annotation
    • https://candbco.com/ckfinder/userfiles/files/fumowipetezenije.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/wupej.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/103626d2d6b9759287cb865ea9ce9ba4/ratizukaruligigoru.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/95de03e4fe4244efccde43153a3a35e3/90644493126.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/karirisix.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dutizalivalobokozuw.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/dupilipakafawuremuvuda.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/38624187745.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/jifime.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/mobalesitaperekusiparinaw.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/95447609199.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078accb330c4---11210980889.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a37151ef81f---dujakox.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/flm8j311ere529bjvoh3ac0js3/51404864480.pdfIn PDF document text
    • https://termofriz.rs//files/biriw.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/13a165d038767342af7ded99f5879162/wekapol.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a56e9ec8bb7---perimumuguketaruxukadaraz.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a28afb55f1---losapivekavatorot.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/19130990996.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/67689343451.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210625_FB87709A49BE4B97.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/26301725187.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210529_DF909BEF56CB7A43.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_off0000d06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06D 16400 bytes
SHA-256: afa53046b7c8149f73f5102f637c833fe37e1109fd09a92223658585ea03e6e9
font_01_sfnt_off0000fa6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11281 10888 bytes
SHA-256: 11cc1032339bfa6a18eef32278f5192645ade8a0ac5114a74d79de8a4c55723d

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