Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4f534dd9840f33…

MALICIOUS

PDF

91.4 KB Created: 2021-07-20 20:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 0765b5f0b4f7b65c4dde8b26f8be46db SHA-1: d68dd01b1c35dea9baf1f4a09778b6d160537e68 SHA-256: 7f4f534dd9840f33d79687100115d085c01cab5c4f7b9ae5e64cea50789e7617
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1005338ed2---48531282983.pdf In PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6fe9eb21---kabetewoxaxiwopewex.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/hva6l36bk2q2qbpt83drtl6kp7/sitovojumujabu.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/sokutisesaponeruneg.pdfIn PDF document text
    • http://stembridgefamilyreunion.com/clients/0/0d/0db03be1a97f3028174cafb645c8c91f/File/76541738302.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/1ghqbtks8n9us7l073puigbo81/selejuveduwepopava.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/66428812507.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/nokut.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/fexupebuku.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/55256766560.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f7da9a7b3---bazomejazabebewitetuluv.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c3f0576d---39094107481.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/detom.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/7067ca5c2c9beb675e38eaa9bd0dd859/lofam.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/makowomoditobalivifa.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0db71c8d8---245772448.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/wulubusowasifibafepudores.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/16597396e70b133b685c9cce98ca01ab/tigixakelapik.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/xixamixenenixujit.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc93d2558c---zefofepanapox.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ffc44de46---tajerizomibabotipoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ration+card+2no+form+in+bengaliPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 10956 bytes
SHA-256: d486b6f5f64f5ddedd1acbbd4df7255bf45a2c1bc1377735c8a802e1357d61fe
font_01_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C17 17176 bytes
SHA-256: 5266362d7e9379e284927b5177773c7c9317b05f679a7d9a174463b7e86024d6
font_03_sfnt_off000148b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B2 16172 bytes
SHA-256: 637a9dac0afc585f1f105c2de408df99420c2eea19216aca5c902ef31b2be0e3

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