Malicious PDF — malware analysis report

Static analysis result for SHA-256 8301b13072e11191…

MALICIOUS

PDF

103.8 KB Created: 2021-06-30 08:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 22b0cc4c0cb0b991602a88ca5a10259f SHA-1: c25166dbdead6580737cc5a6823cc8c181b1075f SHA-256: 8301b13072e11191224d36f8690ed53e4ca1f5395d74d312bd99e49a1e6b5f7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host phishing content or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 https://drafthe.ru/uplcv?utm_term=virginia+woolf+the+lighthouse+pdf PDF link annotation
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/26138342389.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lffnptnk90tr1rs6omltatjn00/lizowifavejitupu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608586851f882---12956304213.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f2cfeb666fae39d0d771eb04af130f7d/34494275114.pdfIn PDF document text
    • https://tmtteks.com/files/52663267139.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/35344120691.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30051089e7---91779349152.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d682ee77c53---tapojesulujo.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896a95b7e65---72196678778.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/aa7tu73lg9td3aror8pkf4b6e4/86275680471.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8c4697c6---33583353411.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc90a97e268---97642975489.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ca75103707f652f88626051cc27efe02/75760002546.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd75e42840---notufumizizizoluf.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/era8c0ohnc2q0k762maarb584h/36543808071.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bnd2hjd75gqoh1jsivu0gg84k0/13980148116.pdfIn PDF document text
    • http://snsi.jp/image/news_file/valeveg.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/lofevazuxe.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/37714462941.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/69635476636.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/45644229270.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac62bea0c14---nalokifixiroxe.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/jidolorosewefawebabapeb.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/de12e05c96ee7f2f67e21a7608d9aa53/23537422262.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_off00013224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13224 10932 bytes
SHA-256: 7359f152f3764340beef6e372c1aadcbd5d6b1be8be393080c3b483b392dd0db
font_01_sfnt_off00014b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16353 17204 bytes
SHA-256: 414223434e85d7938c704cc65e2209162286018153240b6704ea54472679e08b