Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9460afa1d367f26…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 14:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa29ec87abf2445d9007a2f4f1847259 SHA-1: a804d28c09bbd5f83f18240a7f24be2e63671f0d SHA-256: d9460afa1d367f267f83d366afe39ae712353d8d8c275ae30cd8318efc32eb8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest it is designed to lure users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://hagepoorter.be/files/files/nonewepuzufitinakefamoxax.pdf In PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/dejelerobumutofufaboref.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/vawilotovagiv.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16085283c464f6---26413524178.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/7977475827.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/35805647361.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/fulujokemufunidukosipek.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160af23b29be9f---52972684855.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8vtv5ib9g0vcgcqtn29l38i2om/juzudalamulaxarabopaxefo.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/wefuzusavibazemesojif.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607badf0ef3b1---37531503958.pdfIn PDF document text
    • https://chptravel.ir/data/file/gowebunexaro.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/37524332788.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/36274267697.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/nuzamafikikofowafubaw.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/ca9fdb95d0b422150854a315d86118ab/24733854241.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/94428188905.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/nekodokedozupoto.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/wukeligaxonokenivobirori.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/44056854766.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ddf33eb5a---38590653524.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/wawewu.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/99268432092a36dd4ebd934b4e4a3e0a/64833877272.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/aa01ce2965692bb5a504e9aa09b81664/78091823592.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/86992965088.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db43650404f---tukiwakeleve.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f786bc2df13---51423115914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=english+meaning+of+khetPDF 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_off0000c07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07A 10636 bytes
SHA-256: 84bdbb0463f6cfe3e61b2015cfd99e899827f616aa3bb221a12a0f92878da8df
font_01_sfnt_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 16484 bytes
SHA-256: 198385f527175152541df14ae6c5b26842fb7c82424dbcc3b270016718f09751