Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a443a025c52b9c9…

MALICIOUS

PDF

202.7 KB Created: 2021-08-02 19:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8702b4e5418b663916b2c6d1581397ee SHA-1: 0851a26d73723a2248e1f376a0ae43d76a358079 SHA-256: 8a443a025c52b9c9c28cc4b6a612787d4469b7615a8aa1772e1f5cc26502e3bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the presence of external links and the nature of the heuristic firings suggest an attempt to redirect the user to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 5

  • 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.
  • 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://brkvinc.com/userfiles/file/waxanogovu.pdf In PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c48071454c2---mifuvugutubumodos.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/zewokozepuselo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103d7903d1ef---39947685558.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/9e1814aa2547d9b9c80934063a0ef46c/12872490633.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ajhp72kqc3cbkc56tcqom1krsb/40922633992.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081a5fae0b01---nusiwamodikafonasebog.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/detolijuvumu.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d11333542fabfaa077af6a95bd40bcd3/kozez.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/lilifabigufozap.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/84307043125.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d71d72b7---valikurewexa.pdfIn PDF document text
    • https://badrivishal.com/media/97544415624.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920f918293a---roporijixefivu.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc709704f0---matonil.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4356c961c---xowekixobimujidikobidaw.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608465363b9fe---rakuru.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/zurabiwenelebubeg.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/wetadasab.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c523cb7dbb8---41097998102.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad301cdb729---32015061495.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/52b59f3eb2d4a4c523906d6fb0f3b3d8/lusorim.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/nemifarofokamir.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/18759815229.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079fc6171f0e---vubelununa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+robinhood+app+in+australiaPDF 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_off0002bcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BCCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002d4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D4DC 17716 bytes
SHA-256: 8697ed00abf501e578f414f18aac20177c6673265670b4a9856ef793c35823c2
font_02_sfnt_off0003039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3039D 10988 bytes
SHA-256: b16444f380ea7af2a1423f4dbf4e773bc3964b082519e765a580ac75facbf6ec

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