Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efc11c7d0f3bbdb…

MALICIOUS

PDF

78.5 KB Created: 2021-09-03 19:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e6c927b5ea9f0b2849bdb7af3998867 SHA-1: b1b5ca0af9a6a5bcef728afbf2c21d931221d5c3 SHA-256: 0efc11c7d0f3bbdb3de1095340b608842e5c2d55747c6c50cbd0239a15f685a5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f889d162081f7ffed7b8e69e5060db6e/88718647764.pdf In PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/bapivuratodis.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a92482309bb---dusuwuno.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096293d5be42---76046349114.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/xarozuroroduvu.pdfIn PDF document text
    • https://arerp.kr/data/file///nubijokimojiv.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/71691437258.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6baa530d70---13570723800.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/23738071560.pdfIn PDF document text
    • https://promise-land.com/upload/file/tikalifegabo.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/14765122534.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/togilokujesexesiratit.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc39e2c0e---wapexewobimugon.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/57708189432.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c2959a738089fb2fc1292fd2c1f42fa4/pelatejugegumexu.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/82780018366.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89236ca2fc---fukajagaben.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/wibisonofe.pdfIn PDF document text
    • https://atrax.hr/files/xelibalal.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/domijapofa.pdfIn PDF document text
    • https://dm288.com/slicice/file/75370508798.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160805a68e2b7b---17120607695.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2ad6dbe2871c013d3ebdecabf4ebb8ff/ribizekivawolevokare.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/59689163107.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/xijosalojibedug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pdf+kd+tripathi+pharmacologyPDF 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_off0000ce5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 17256 bytes
SHA-256: 51d154e5b97999d19eaa69ba5b5dca457678a228bbb1f994d06a1c80763f9c10
font_02_sfnt_off000112e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 10872 bytes
SHA-256: 29897bd6948f9d2e177eb131e1c1d9317cb42765968059f7a07c77643106bb61