Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a6f5495e195dc7…

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 10:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 244f452c9d2dec9b219a710f3f2be6be SHA-1: 9efe8a4f7bc8514ab3e31f57e94c36aec313108e SHA-256: a3a6f5495e195dc708a8477ddd464cf6edcc01102ec195392d83b1afc1e9d9f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=naruto+shippuden+ep+150 PDF link annotation
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/tiwugenod.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131fff942a4b---sibukezoxaxizanizaxuwuk.pdfIn PDF document text
    • https://ferropula.hr/files/wawiladirow.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/lakofoxozopaketom.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/lazasisoxini.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/85584912569.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/vawulid.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/58168541037.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141462538938---74276273845.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/2244164667.pdfIn PDF document text
    • https://allianztc.ro/files/file/507898745.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/kowenodazo.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/53492939088.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/5346252267.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/17333274369.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/16932151723.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7797b36f2---zozevawok.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/fakomuzutagebidewuwotewu.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/45866113321.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/wofotopolatinafux.pdfIn PDF document text
    • https://buyafranchise.org/files/files/xanetozemuxofa.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6jnhnhbu2rs7ogccqcmsm6g7a4/vixirijopumabaneviziri.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/digawobuzegefe.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/19297412501.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_off0000cabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABF 20176 bytes
SHA-256: db63a1373b656d3ba3a8e87eb7121183c443074463acb3507b98400a7771808b
font_01_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 10828 bytes
SHA-256: 8bc49ae7ea70fcbd38697a8d96a480fe8ff89cfa9bbcc2fcd741486b76d9bcfc
font_02_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1