Malicious PDF — malware analysis report

Static analysis result for SHA-256 3112ecb430a2f6d2…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 22:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9cdbd0817d16fabc46426d4605f2b950 SHA-1: 8eba017c68ae2d1d3c10432c6d454554d861556b SHA-256: 3112ecb430a2f6d2f4b236ee262186b16abdbcb4a156857a5ba91eb4ed35ad6f
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The PDF's structure and embedded links indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://classicalgardenornaments.com/uplds/file/jawozijowe.pdf In PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/73350413273.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/69406171947.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/jizuluwifa.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820af6884e2---kavav.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/vuzunutajul.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/dikogudixexe.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/rizagerafatazifulexeludo.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/55473468910.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/75534097736.pdfIn PDF document text
    • http://rotterdampools.com/contents//files/kurajig.pdfIn PDF document text
    • http://tulga.ru/editor/files/meforibiditafow.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/42223065377.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/91drglh8pa97eer7tdrf2phddj/tagujuzukuxonogubo.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d5f562c3a3acbac6eee32ac8f63f0905/wavevexinekesosafivi.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098473c18f09---79807681561.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/8417827963.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c851becf1ba067b46537fec2fbe2ed21/tuwaxawoxogaw.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25c15197f9---57168041216.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/39232957818.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/46386551294.pdfIn PDF document text
    • http://oodow.cn/upload/file/210905175345759060asob1rl4asgb.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8u7vrt5hu2a6vpkup1hil6bvm1/kokiv.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2760f04ea0---bokubojegokexi.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/311452509459.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/12490488563.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/6rl9b3plbohuemtq820dnsr6dg/72148904206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=clinical+epidemiology+the+essentials+4th+edition+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_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 11192 bytes
SHA-256: a02ef5d0099b914d157d4c65c6a66d958aafd445cb729d0a09255be810bae791
font_02_sfnt_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 17128 bytes
SHA-256: 35c65f939ae305fcf9ae53c077b6ba37095dfce6fb2b475230eb57720ecf2559

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