Malicious PDF — malware analysis report

Static analysis result for SHA-256 e238f6deed3ee4eb…

MALICIOUS

PDF

88.1 KB Created: 2021-09-18 22:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68ce2c8dc640d6ab77f18e6969b5c93b SHA-1: c5430a1b072831642e6b60bf2a7076121860c45e SHA-256: e238f6deed3ee4eb21108760e575f15e77b9c0a7df1a5fc015dc9c370472af42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to manipulate search engine rankings or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=top+10+sites+to+watch+movies+for+free PDF link annotation
    • https://kenkochaya.com/user_data/ckfinder/files/zibokixajorukujeve.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/xunavanovitotoza.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/varubuxudodutiv.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/91527226374.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/bitefetokoxuta.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/2ecdc66e32c85df9c58202d021272d54/rozilejuv.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/kogapazoxomurumufuze.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/44991649475.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/26899981691.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210910205336_80p6w6.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/09e65b7baf04822fdb2d14b556bdf8e2/liteperemilizas.pdfIn PDF document text
    • http://th-hl.com///upload/files/baxoguxaxeronusitiketu.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/namozuxeragiwowa.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/29528050445.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/gebabegazekadikote.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/fd29c5b81b9b96b259c20a431a09a68a/86996224977.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/86145977873.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161440c81143ad---dutepiveruxadedulira.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/nipufanul.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/zixogasekamu.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/duziwanimera.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613d871e106a4---85501810820.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_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 10884 bytes
SHA-256: 683dda115ddc5b08218651e8675afe7181c92ad918b736157d72a17c6387b6ea
font_01_sfnt_off00010dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D2 17556 bytes
SHA-256: 90b7dc93b1e95fa398f1c62f15a47c90ecc8c2dff8c11eedd96a1ae782875009