Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1b0409da3f3cc6…

MALICIOUS

PDF

86.2 KB Created: 2021-09-17 22:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 74accd2aaec7942ea43dd73b2d0d381e SHA-1: 7ad757ca3e56fcd2e3e0e16b2f67c54f28c9820f SHA-256: bf1b0409da3f3cc6b8d531b56314e2cd13b0fcdc70d9bc46e249e7a08bde068f
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic points to compromised WordPress upload storage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613611a32a93b---vidalimadovomu.pdf In PDF document text
    • http://jinshi66.com/uploadfiles/files/92606350878.pdfIn PDF document text
    • http://ux-school.ru/files/files/rimew.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/31727594109.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/zixofepufuk.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/kesopamib.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/36964076418.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7b2d7e81---88203993213.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/towiwew.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/cnvua1kv94p6n0cjfra0jn1bri/xepoxaraxusezage.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5a9517d55---70062560663.pdfIn PDF document text
    • http://topstec.com/d/files/24371366736.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/tepewetasedazi.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/kabom.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/79974565510.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/70388424663.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/luwizip.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/dosuzowixovoxaso.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/89933226361.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/32475857655.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/4377921699.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b427203cf1f4ad3239800ea5c254214d/41818838419.pdfIn PDF document text
    • https://stormester.no/files/file/saloberufekajozafovejuka.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/28629501017.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/86754246152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=film+complete+streamingPDF 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_off0000eae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 18404 bytes
SHA-256: 668e6412a350ce07f8f375a6744bf860a6b6ef9a1046025774b9ce881b7a6b0f
font_01_sfnt_off00011a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A2 10696 bytes
SHA-256: 9612a2fe2bbad2c40099a7baf47b8484e6a278648b47cf5f8476242e370f5f7c

Open this report in the interactive analyzer, or submit your own file for analysis.