Malicious PDF — malware analysis report

Static analysis result for SHA-256 3baeda3fca1c578d…

MALICIOUS

PDF

87.0 KB Created: 2021-09-04 18:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3fe104f4dfef6e4aba797d0ed987ce2f SHA-1: bde3f855d256abd6d027d81fe03574f1650a0230 SHA-256: 3baeda3fca1c578db3c47f4216a9ee3b7fc78e5f67da29654df0bbe7475c7452
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=luminex+100%2F200+user+manual PDF link annotation
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f26fecf253---fasabalamux.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/pobekowokesovamoneluzej.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b87327a8382---ziziduvelukenegigulowip.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/jediva.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/82178945858.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/43077113128.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/dd932ded5a6e1e57ab0f03d2dc7f1d2b/koxetototazumupokaki.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/1237738652.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/feviwejawopo.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbb9d3a33---98999072117.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/db87f9dc43ac83a4c3029759765e0b14/dadaxolabedijixilevo.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe828b37a0f---71205068951.pdfIn PDF document text
    • http://kleiberit.ru/files/file/gitomalesazavuz.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/69003401953.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c249b955ce7---lomivitepaloxisezipe.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/jegavipekujatigawajam.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/4930586204.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/8vmbosubhe01dlc72nrbil88o3/gomenamenimu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/0b1d95d2aacc18b510df0f3da62e6e53/22433527908.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e0fadfad061c18a33f4284f7dffec419/69747636567.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/76425526756.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/mufizituzudedi.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38668104ba---vagilevaketevojus.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ugbhvu7bfci52cfosee2e8rjl9/42181186574.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/31561156025.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/197fb76394049e0e99ed128e0fd1e4e9/58891115936.pdfIn PDF document text
    • 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_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 10536 bytes
SHA-256: 4741104fa1448260b5e489ff83a42cb6319a52a36042c5f801cd4b3e19d38397
font_01_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 18204 bytes
SHA-256: 478f6937fc56115002a9e57d6a815a5781cc50672a02d330546015312b525f69
font_02_sfnt_off0001362d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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