Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a3681302997fe7…

MALICIOUS

PDF

96.9 KB Created: 2021-09-04 21:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3bfe1b2800156a106ca9b921d50d237 SHA-1: 9967bc9df019a6ab472b3c8f07c9fa93b94f9750 SHA-256: 05a3681302997fe798a109b28595dca00e3e23ab6f90c5640d4848c4ecbf62ce
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or contains phishing content. The presence of numerous links pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://yonezawanet.jp/units/24250/zcycom/files/13346634616.pdf In PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/49a310ce697d721932a5270e70c889ff/9413542864.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/qjhv683tefjtf4m1atga9876rp/83147429348.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19d423d1a2---fudasipixunoraxukubimi.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/80828548816.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/kebewugituv.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160acc731078a9---sakofepibag.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f20012778fa---59323313567.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16102ddd8a8113---17921431720.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/41025963190.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65b3d0cbba9a64ae64702651cc433a29/vesavamaze.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/mewudagokur.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe02b941f0---86039002593.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/98807179710.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/guxogivepirozibikusase.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/80025442937.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/77974040141.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///jojujuburusadegozu.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/vefubeko.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/8585427296.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/2cbslq0oet2ltuaak4d00dgqg6/20881952545.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/66802700790.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eb6d55505---jobewanel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=solar+air+cooler+project+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_off00011307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11307 19724 bytes
SHA-256: 8a164b588f2921b3a9b40e0c6388962099c7a9e2b07505b867328c6d1f0ef3f2
font_01_sfnt_off000145b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DCA 10544 bytes
SHA-256: d7a2ba7fb7e384d9b9e4cbefe965d1ce981a964111006730fe52bda59059b5cb

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