Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b101635618a3a3…

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 17:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ce11d458ceb45306aac0c331dd884c1 SHA-1: f3c9a9d020475fce1bfb3ae7eb08b543cd2897e5 SHA-256: f0b101635618a3a3f10c18a4c063ddb8c0ebe982a1a4ab9996c19aa3663ee5cf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit vulnerabilities. The primary function appears to be acting as a link farm to distribute traffic to various potentially compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/6374ef6c478d0fc4d8b9d0f86088cf10/xiwexiruz.pdf In PDF document text
    • http://vector-mebel.ru/uploads/files/36758785591.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/pikixe.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/34108712686.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b18d3736227a092b745bef6d6b9a6527/90466770859.pdfIn PDF document text
    • http://nfc.soo.jp/file/6443882295.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adca1dc27b8---23523965103.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed55fcf51d---jotevezulivon.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210715/file/13748934730.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/dakafapadok.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d489dac67c---55369207886.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088828eedc27---17830383439.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/febivotivilufimuw.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/0ba246754e6d52f92b839ee44fb76808/turigavowenolazi.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/44498788116.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/gn1rplorh3nf7hll13elj26l6j/sewunopiforefepuwapiriw.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082dda61a867---xuvemabututexodilimabilo.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd38563065---pipawe.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/461fdde8a4b473a922f701149fe507f3/zerofenugomozume.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/gifis.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a9520560fbcc84d888e3bbc9f3808938/69038216240.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b1917e4de17---lawiwubes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=schopenhauer+libros+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_off0000c3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AF 19336 bytes
SHA-256: e7d634dc9cfdf896e02aa0e488865c6bc5b9350d1900d75abaa94df67b1e6e10
font_01_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 10936 bytes
SHA-256: e604a633f4438f71b462764b6aee732baebe2a1a015e63864121f5c91e184510
font_02_sfnt_off00010dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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