Malicious PDF — malware analysis report

Static analysis result for SHA-256 8151426d68a68a96…

MALICIOUS

PDF

74.4 KB Created: 2021-09-02 17:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ca8b0b4481515207eaaff28da1dbd681 SHA-1: 8ace79f0a67e4ee23e2b11880d4bcdfb0300a598 SHA-256: 8151426d68a68a967aa4a61e20243ba93f9edcfee4885b65d53dc35c530717e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests it's designed to lure users into clicking these links, potentially leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/d7f8c81c4024b89ba2492cf039b1bdd7/pofaviv.pdf In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rduium8fdu2nsot3mba1omf9i2/kezoma.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/68599247044.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/dotuvalonas.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a890954d40d---nabusewoxovuzewutib.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/lexebog.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/888af9d2ac0d2d9715442c363fd2a593/tofufasuzozowoga.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/dutosopibu.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/3300629993.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24cf4953dd---kijelo.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/bomovetasabufadesole.pdfIn PDF document text
    • https://lapakunited.com/contents//files/10960488059.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb44b1b04c---44464141123.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/60824499003.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/da1f1f95df9dea2dcc7ec3093fc868b1/13575801661.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/panawa.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/jukibobonazama.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/zijenapule.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722d172d97a---98985129974.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/nufuvefitoveveda.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/50ntuou9r9a1hso3tg040qq6m7/44952001797.pdfIn PDF document text
    • https://olterus.org/contents/files/tenivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fluke+1507+insulation+resistance+tester+manualPDF 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_off0000b999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB999 18620 bytes
SHA-256: c9aa92eb61fa315df7801348eb44ff885d38b8a0a1b53de68924d1dc2dec1d3c
font_01_sfnt_off0000ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10252 10920 bytes
SHA-256: d4d86fb7083fb083e14e1b6c5bbdf39d83caf21f8fcba677b86581004b2cd4bf

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