Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3a71c5ab51cdb5…

MALICIOUS

PDF

90.0 KB Created: 2021-07-05 03:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a305b950702fa5ffe8bf3960b4f2caa4 SHA-1: 7a7754aef0267e5953966b60937c5d9f98201783 SHA-256: db3a71c5ab51cdb5e059e5974417b8fb4c958f4d357e0727020319bdd88955f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The PDF structure itself is identified as a link farm, suggesting its primary purpose is to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://infrive.ru/uplcv?utm_term=fill+in+the+blanks+with+suitable+conjunction PDF link annotation
    • http://cleanyachts.it/writable/public/userfiles/file/gepuzasetatulubur.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16076a4451fe80---volezubovujowuxuba.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/kofazekugafipodabaza.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/8223746868.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/zujofanulupixonubo.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/fezeluj.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/71371222359.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160748d4a53e9b---rarolawavunuresuxilu.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f35ed677---jiropuzawepe.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/sesozugivegilururuba.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/2ac036fb93eaa14488b09cc7e1475a2c/fekasewotometor.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714fb669118---kigazojanavasofaba.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0709531338---lasedinilepakutufogiza.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/hm5qeq86o1f585a5aeivs9m1t2/28655273241.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a85b3c9c82e---vopajeparunawizaputixa.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/059f6dc3aaa467e3800c735077d040aa/zireranefipun.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/libitasixemajemuz.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/13635005a2c1a8670b0e3d849d9a9187/zosozopaguwikedotufefen.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160715a6343e82---98161231009.pdfIn PDF document text
    • http://foodchemsino.com/d/files/fikisusolopu.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/86138521959.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b66842b85346db94df5d88e88c2c8417/48966158392.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_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 10752 bytes
SHA-256: 47d39ce7a67acaac584d3816e131052f1c262e77aa0a2dc6ee356e91d5cacc61
font_01_sfnt_off00011387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11387 18092 bytes
SHA-256: c6399fc8394087d23effd2bcc2a05c1971ce222f7cf6d56a45a12ff9c3d2c3da
font_02_sfnt_off000140d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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