Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa2018ae60cddf5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 04:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3c30bce72ee7066275c438ebdc5dff1 SHA-1: e7484173fb15314f71ec7e58fdfcf9011fb83d61 SHA-256: 3aa2018ae60cddf5d4da7f44f379609afc2a70a006573870f3fee1d3ff7a71e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities and delivering malicious content. Several heuristics indicate the PDF is part of a link farm, with many external URIs pointing to potentially compromised or disposable hosting sites, suggesting a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kirilmazbardak.com/userfiles/file/guwezo.pdf In PDF document text
    • http://dejede.com/userfiles/file/53343646650.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/nuzora.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/1b25b17ca9c75347a0fd46adac908ef5/86104758258.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/kewalidotuvilewaluweg.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/79144940817.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/67931301822.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/14566660251.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/pefapiwelu.pdfIn PDF document text
    • https://mfdesign.hu/files/file/bovapudufigogowipusi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a5ccd675f---wobobalobi.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cc11249f8---nijutej.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/rotunegereju.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1869a1cfc---rekusudowapaguw.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/12320766647.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/53323395052.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/lujoxomabenobetixarigew.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1b900589---43919060290.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f416041f68b---zoveletuduxu.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/30764343711.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/dezirabironudibafebu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612d64f746724---30892926635.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/magut.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38482d9f5---benukalomizibafek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=bacterial+wilt+of+brinjal+pdfPDF 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_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 18680 bytes
SHA-256: 36af536ff20975a571331b00d65fc8410ecc11e07e3576363f0d5ed556a51f4b
font_01_sfnt_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 10856 bytes
SHA-256: 1734969791b5b574542d660f3580730c0ec23a6f388c4b0cfe759c2eab34ff4a
font_02_sfnt_off000125a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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