Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5fc4c4396e8d21…

MALICIOUS

PDF

86.1 KB Created: 2021-07-01 16:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ee01014ddf6b4b46e4ba5757e1a40127 SHA-1: 2cf501e0d2642b053d96c267d703444ad246192c SHA-256: 8f5fc4c4396e8d21fb5bbf52f904a1f4a2e12c3e999bb59699aca771c9827ce7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware delivery lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://digemnd.com/UserFiles/file/noluz.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecc0db6cff---josatorizo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9463427063---luxeditupefororefixazazo.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/segox.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/65998794788.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb6c6570f9---26906991076.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/5p9bfuce3canc5eg2ap0mml5d4/49279994846.pdfIn PDF document text
    • http://greenbrier101.com/userimages/ronurovanibegufezaba.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/e61h336a1hu6f9am83lpdmqbu3/18577657294.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/63593817096.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/nofesetubizisigu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/74721708613.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/65412642212.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc0b8881b---63685188676.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfd9849844---bategamimowugivesobo.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1642b18c22f0f9664db88d708fedae99/35656287975.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e6dfb87bd826d47e87c1dbff1bcc1680/dutepapidowo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8014d00f.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1267464f9d386a287a074ed76f57776c/38237244902.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/nizopagupa.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/87951600947.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/dff66af99b90ca7369447caf79c9e2d5/76069267750.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608522167599a---zabom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=orchid+mantis+baby+salePDF 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_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 17236 bytes
SHA-256: 3ccc3df5a3af53cbd223a2ca186ac5414ba06051d622c4d6ac16ec96c52ba4a2
font_01_sfnt_off00011a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8F 10792 bytes
SHA-256: 15b18fcc95b7a8611a99eedc11f842efb87efc1a17afd4197fe717cd3c7925e2
font_02_sfnt_off0001334d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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