Malicious PDF — malware analysis report

Static analysis result for SHA-256 6108d53eaf2224a5…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 04:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bc5d742bb031c3fb9a37347eca17030 SHA-1: 104bc3ab11492f1926275b6659e11827c6a734f7 SHA-256: 6108d53eaf2224a5552f9c3c93275b06d32168dd4b8265ad7d09617a5e33ddc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=essay+writing+connecting+words
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161352a6bc7c49---rogalajutadagutegotonide.pdf
    • http://bulgankhangai.mn/userfiles/files/78137639241.pdf
    • http://aleshashop.net/uploaded_files/userfiles/files/42430210458.pdf
    • http://alpinist.store/sribati/editor/uploadfiles/24316800657.pdf
    • https://autosaloncenter.com/uploads/file/78003643112.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406d2260919---92569424981.pdf
    • https://cursosadistanciayonline.com/medios/files/zojakekelefebefovo.pdf
    • http://patriabrno.cz/userfiles/files/wuzuvi.pdf
    • http://analhospital.net/file/files/80147376883.pdf
    • https://eltechma.com/zdjecia/fck/file/mobutot.pdf
    • http://risorsaterra.it/userfiles/files/voratajuvajufagozeni.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/zunekebavujijijali.pdf
    • https://travelsafeway.com/userfiles/file/wuwozemevudodi.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3bfbe62d81aeb249bc4c144882b305c9/jupetiduzasiti.pdf
    • https://nhahangthanghuong.com/uploads/files/jovodag.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/36610a03a5c1dc966b50961fc2a9e3bd/78380583328.pdf
    • https://gulfb2b.com/userfiles/file/sikajivegodog.pdf
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/93761770294.pdf
    • https://lmbri.com/WYSIWYGImage/file/63887366139.pdf
    • http://mamitobe.ru/files/file/rilatutofulu.pdf
    • http://eros-arena.de/eros/userfiles/file/wepabujepigur.pdf
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/kusupuvurewabusutixeb.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b2b2f72c5c8c32360d1fd031cca0904d/lagadon.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de24.bin
d44db3fa31641c0a574cce25a87c844fbe0a2efac88413b4d0b8d993e2e96f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 17288 bytes
font_01_sfnt_off00010a59.bin
0d0e4d822285fdb30ba8395ed7b29de9935a78d936edbc6b202dff6761c0c2f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 10684 bytes
font_02_sfnt_off000122e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 16792 bytes

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