Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11e011058c500da…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 08:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8dbf3e7a523f91aa060890510e36733 SHA-1: dcf5e24cbbf57cd363c1cf0fdd00a4fa9faa67de SHA-256: f11e011058c500dadec213d998eafef613cd921420542438613edfdb24353f9a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple unknown URLs reinforces the suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161310308ccd89---bavuguzizodadu.pdf In PDF document text
    • http://special-pharma.com/upload/files/fawuwuboduvogefejudubi.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/73900053080.pdfIn PDF document text
    • http://opersan.com/file/wabijegozopedigevafe.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/tusefeminifibi.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/winulen.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/luguzotivivivarisig.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/wobunewag.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/52043175395.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/61820327027.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/69090713023.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/janejawupusexapemidor.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/50418716923.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/20442159868.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135f99a9f843---rijewesuvogujokezawivuv.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/35367233640.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/76882814732.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/95776439023.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2tjbino0tlspqiqt4jehv2j1l8/76329453279.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/zaxisemujimepujalitu.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/36894280946.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/bikekogiteposomedu.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/90946699694.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135d35b224fc---vigekorubi.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/47398120619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=after+effects+2018+crackPDF 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_off0000cc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC56 19576 bytes
SHA-256: 97c8401105eb12134e5594d989e20fddc00e084305d5f0acd237d6a2f2a457c5
font_01_sfnt_off0000ff4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4F 10540 bytes
SHA-256: 3fb26f8e614702a303d7a0ea5fa1926bee773540f95881e5f3270aa261c98281
font_02_sfnt_off000117b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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