Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d4e3e377661c4d…

MALICIOUS

PDF

87.7 KB Created: 2021-08-21 10:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 899b8934fd976f4aeed42952a21a26b9 SHA-1: c6b29f9bf5b8efdfb9753f8ba07db546fc84d79d SHA-256: 34d4e3e377661c4d1d5a4064b20c571b3e44797b607f393ab01097fc066ba0ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable hosting. This pattern is commonly used for phishing or to distribute further malware. No scripts were extracted from this sample, but the structure and URL distribution strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://alnoorcity.com/userfiles/file/fazemuwusujarogizofidog.pdf In PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c6750fe60f20a167f022cd278cbd198e/18557806448.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/fodiwetep.pdfIn PDF document text
    • http://ombs.ru/uploads/files/ligipatimasimaker.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/79b4dd443a302f6d9d991ce5c6e139f6/jisepilekobavabo.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9089653c14---goximojitewozu.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/41388430038.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/82583548217.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/37f36lft02ou3rgmp02ji3qla7/49358781030.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/41968251577.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/1029724789.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/56545134513.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161183ce9d1664---wirixatogatizekapemaka.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cfa7d4d0a---wegujolebalujapud.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d159111a20---vesimaw.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/64272084224.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606eab23793e0---tijajin.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1c829859---xozemufuwok.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/804d7740a77d3b51e5d543e67afa55e0/jazel.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/16562716320.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/3407041762.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a12457395c---55470679719.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/94856207843.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/77547908778.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/m6c4rtlmajo1ip8km1dhbulstl/wukoxiputunal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=why+wavelet+transform+in+image+processingPDF 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_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 17404 bytes
SHA-256: 93ee447f19ffbaf5f9f3ab17a3981ba5c86c2dd848bfd1a8aa00abb8caf6d178
font_02_sfnt_off00013607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13607 11184 bytes
SHA-256: e41155867cf3918a15e54debe826f6afe7f1a0c8e7318da97755f9d92133a2cd

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