Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e8f5a5681006f1…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 09:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea5b7bd3e497adbb1449bdc26adfa0d9 SHA-1: 76afe29767e60e5857a30f69355123a265dce477 SHA-256: 83e8f5a5681006f1d998f47cde19599aa8c9fa19f6fd44f77bb50ca263541d2f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://irlanc.ru/uplcv?utm_term=feels+like+my+jaw+is+locking+up PDF link annotation
    • http://allprintusa.com/admin/images/file/90177755496.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99c77987d3---75649508909.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607bddf958fa5---86898034930.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c27527b2ce---79634293643.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd7cb816ae---65234923782.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609023d18f28b---fajezijevijexavosavozokok.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/97637318426.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/58588456189.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/fukugegi.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/gifodebive.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/rumilasevomuxuwuk.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/g4pse4rrs88kct5109hgrra4hs/tofutamakozezivotonuf.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/sigovufukaja.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/fijemotufujineju.pdfIn PDF document text
    • http://mlight.cz/archiv/file/58590317266.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/abce404813f9dd26d66139bd9c45e6c0/52451712650.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d18542713bc---44080277.pdfIn PDF document text
    • http://platcometals.com/images/file/70328756258.pdfIn PDF document text
    • http://safetypath.net/cms_images/kapakofijirobuzidipiw.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/13213602373.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/14556854714.pdfIn PDF document text
    • http://qdjshg.com/files/file/3323014956.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/90051137640.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ec90781cf72b9409cbc33e8564034a9f/medowuluditaxafu.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/nusuxurewe.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/fawuzemigufo.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/1c47cf1d408fdb413432ec8b00fdff12/dadozokupumozaxu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 11016 bytes
SHA-256: bfe3258dd43882d20647e87ba56344330c0ac17f5db5b12e705875f45c066801
font_02_sfnt_off000112d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D8 17432 bytes
SHA-256: 43bcac69e6fa5e723f8c389f227b07f5c34b46281d7725ab7028f2451d82528e

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