Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cedb3997e3f55df…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 00:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d4ff3a9a863e2b1d300c669c74d45cb SHA-1: c41389be94bafca33eac48b63abb842004f7528c SHA-256: 9cedb3997e3f55dfce50b80b33c2da4577f6a6cced77bcf893ce7a962d708115
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=steaming+frozen+king+crab+legs PDF link annotation
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df27ed418cc---lelolagojubib.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/94417238680.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/86765163888.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609643c9003f9---58837523426.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210613_E7C85B6CD2658ECD.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/20337531739.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/hescutodn02s5tns8gk5tnjpfv/14826192014.pdfIn PDF document text
    • http://cityfate.com/files/files/10673687748.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b483011b99a---divuzolulajajijajima.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/vakaxokowog.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b6a7e218b---risabufitudavunoko.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/27404998172.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/4dc9dd075193afbb1ae420cd3de2bffe/10082627231.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/fimikijivezikomen.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/lipopewakofogujopol.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/j7coalogs8hus0semhkk5dva32/68600795142.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/c405853dc62290c319d0a70625fd0287/90998809583.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961e1d1d6ee---povivawadikotawa.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a721f6256d---xiduzejowetupisi.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/mujetikamazegev.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/35784823672.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/9693767525.pdfIn PDF document text
    • http://dolonchem.com/upload/files/pukexofavezum.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4415e6b91---45564124717.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/81108545193.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_off0000df93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF93 17816 bytes
SHA-256: e59a59b17541957f1177af7b0b374cf8fbdc6415442c2bed277f7e613fc182ae
font_01_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FC 11044 bytes
SHA-256: c5c1918680e73b1f4bfb4ffbf2d39702cbc5967c623129bd693ad5864b4f64d5

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