Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a04e2e2a177535…

MALICIOUS

PDF

106.7 KB Created: 2021-08-06 21:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43aa7f30dd4683f87223f5dab0de1f57 SHA-1: 0ec0e0fd7814a411f7d3ced6b5f9e04f829724a9 SHA-256: c1a04e2e2a1775352dadb43f9603b1c92a0a544745b564d6f17c6bf2614a44fd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially malicious domains. The embedded URLs suggest an attempt to redirect users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://inwebjor.ru/uplcv?utm_term=minna+no+nihongo+renshuu+b+answers+lesson+30 PDF link annotation
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608796d925511---rafunepunisinimomatirudo.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/n6sqc2i54i9v63jv2s0e74t7vc/38068198123.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/dekinozugojopebedagig.pdfIn PDF document text
    • https://bataretak.com/img/files/file/sofas.pdfIn PDF document text
    • http://splogservice.ru/content/file/wolosozirunule.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/sakolaxubexoval.pdfIn PDF document text
    • http://gibson100.com/clients/870224/File/girinigufetelituxapaw.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebd1b49c5c---nodevofuzudoxurajugamidez.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/gititobekokisusimigeji.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/0p1pkfthtno5ns623cbjsgvbnj/fenotazemug.pdfIn PDF document text
    • http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/fujumojevure.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/zejiremileboratukodavi.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b85b53284a9---tixanarebi.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/7826ae246bb6a199f349c9bb9d29c89a/64658140297.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609050ef0ed8a---59690037048.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/5456d057592947a87354cc4bf0cfbcdc/kopuj.pdfIn PDF document text
    • http://kimthienbao.com/userfiles/file/80804852972.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/73300728175.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/06/29/63690780339.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/botesodidipur.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/4643619754.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8edab3982---31372516161.pdfIn PDF document text
    • http://bjallstar.com/upload/file/77280918354.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/12630194501.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 10904 bytes
SHA-256: a9f42ce342f0e5c9752e317b919ac957ccf3a2e9159cbfe14ee3a0326616e6b0
font_01_sfnt_off00010fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EE 25832 bytes
SHA-256: 4b3b1b4f9625d525f55977fc14a33c6be3a58fc83ddd2496d3bed9378e44ab8f
font_03_sfnt_off000172cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172CF 15460 bytes
SHA-256: 2738dfdac0b5017120dfcdf3e138c2b77c9384515b00e7ac8f61ee2109a90301

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