Malicious PDF — malware analysis report

Static analysis result for SHA-256 45536b56f4cb588c…

MALICIOUS

PDF

98.1 KB Created: 2021-09-06 22:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3d1ff3c9eab45482e1297f075bd6505f SHA-1: 2e7657e225f7d1c95b3302a44f3fbe351d1e1d2d SHA-256: 45536b56f4cb588c9a9224809ba918b189d4e6e6ae9102bbc5a1d8f531239d97
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate the exploitation of PDF vulnerabilities or redirect to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/dc1ad8da99804c8abf1599e8dd318e30/68695667546.pdf In PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/74220923883.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/18104004653.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/49868771437.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/3467882505.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210828042657.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/zejikesuwoxoturonizipi.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/lb39i0ch9ggpphg1i2ovvbpng5/40056749960.pdfIn PDF document text
    • http://techmechengineers.com/uploads/37920865672.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/maxegejijevitagakof.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/niwanovukota.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609620f6c0571---lenosuj.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/lupigukesoweluvojot.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/xatabedufagujuxar.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0a403f65---8339840184.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e61db5c8e---gufixuxawuvunirex.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/67267666522.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/086c13dc162668d90001ef0cefbcb8c8/69622903393.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/20276537647.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/giwumepetijabivufa.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/7c7a36c7cb81d89da4911f390021e77d/71414817773.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/mufadexu.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/fujebopimiverumejono.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/2e6da1fe906713d29f6d5eefb2fb8930/17072369527.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/xarudum.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/fhv6nisa6qgovagsraacuuklh6/zasuvowevobix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=enunciados+fppc+2018+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_off00011225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3C 10820 bytes
SHA-256: 1a6f698a13b8e3aea6d118701d5a43223847578be055ab829f32ca3f3d45acfa
font_02_sfnt_off00014351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14351 20428 bytes
SHA-256: 3f38ee3be4a169ac1d8d8254302e640a35266bb69e6e37b9ece51567d52bee68

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