Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49e3cafd3c3608f…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 17:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 535faea41e20b9b3e7b2aee4f6b160f4 SHA-1: 8a251d66039fa1d3d013459e096da395d30d7860 SHA-256: f49e3cafd3c3608f7b1bf43ba1be949dfdaea2a92db5bfaf486504053385d960
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or scam campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a network of links for SEO manipulation or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://rgcsmt.org/ckfinder/userfiles/files/renewegumuriz.pdf In PDF document text
    • https://gemwares.com/userfiles/file/nipasulexaloxe.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/1276645144.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/45747950236.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/53828235759.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5fp5tliqn6vvi8ckc2li0h6bp5/74560606777.pdfIn PDF document text
    • https://swiz.eu/files/editor/69266907514.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/mevadosolutejuxed.pdfIn PDF document text
    • http://seamacros.com/upload/file/vebibujenazafumonaduradu.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/faluwu.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/pitizasili.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/gomowelekenemirewazobeka.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/mewekokovegi.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/voligebogalixuferef.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/dugodotegimu.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/65073200348.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a09c2838a5---97748302984.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/17937577009.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/zebenejovegin.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134f03ce5099---97156480428.pdfIn PDF document text
    • http://didopack.com/files/joviz.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/nezujoludi.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/getejalisutakigu.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/xofomujepabek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=bloxburg+vacation+housePDF 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_off0000d228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD228 16860 bytes
SHA-256: 5fc8bd13a108fff17e3492ea3cb6a058f926a536fb2ad14fa4c9b948e935bfae
font_01_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B8 10968 bytes
SHA-256: 0c2d160d5d57fa1a8590695e38c44516005898c5513170b3d9c59642976164b3