Malicious PDF — malware analysis report

Static analysis result for SHA-256 f308186465a5ec0c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 18:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2db2a4048da05e1dfafdf763b720b944 SHA-1: 89b677bae4b72310201ba9b57c6365c32b931651 SHA-256: f308186465a5ec0c1656e3af16be98f854cbbe60edcfe0ac32cb209e61f219e0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an effort to obscure the true destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://charming-dc.com/uploads/files/202108310258288851.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb8c336a2f---66138725069.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jezuvotefipukojik.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606f11b5eb260---75195857115.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2ca7409ec---xanonekokuwipa.pdfIn PDF document text
    • https://noventa.cz/media/files/file/42798868957.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/a19f4e8e82a706220b21c7d923c04c0e/71588558873.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/jjohj0hhhm8fvfall2tc44lbs3/muwawajuwurumorurotu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cf0882499---22566517069.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/zulosakabidap.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/62825990398.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/66754331385.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160909def9b683---63120293031.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/53026806818.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/vekupuji.pdfIn PDF document text
    • http://sparkpro.lv/content/file/ripadamitagigubed.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e0782d28a---89206382411.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/50649713455.pdfIn PDF document text
    • https://csodamalom.hu/files/files/82752060326.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cd48d24ecf6---30998333717.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a4893ae24191cced1cd8b58a7533ca24/64080310927.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/71309461629.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/niwuliduxegizov.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/72584871180.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/59778323791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cours+architecture+bioclimatique+pdfPDF link annotation
    • 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_off0000d2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FF 11200 bytes
SHA-256: 59d7094f99e5b295cd1aea83456c5f82aa30b460f3af49fb5e19baa5c9940338
font_01_sfnt_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 18520 bytes
SHA-256: e1d18e647279929fbaad1e8b56da4838fea3df71e7a15b129e21c7b0df1bc16b
font_02_sfnt_off00011c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1