Malicious PDF — malware analysis report

Static analysis result for SHA-256 a350a4aa2446a794…

MALICIOUS

PDF

87.4 KB Created: 2021-10-10 18:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb05e210e1741df63a47df4eac732534 SHA-1: 2d061a3161d3683a36acfc1611be81ae85178d83 SHA-256: a350a4aa2446a7941d90f355133ebcb199d1b3951c9b30bac4013ac7f1b55ffc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=peace+lily+wilted+after+repotting PDF link annotation
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161540c9c7dcd2---powusukuxar.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/3b9de21a9e279bb168a0592928ca3c3b/68074056226.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/221c1cd464f633f4ed2b2e66ba84479a/98458896318.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/35251241436.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/kisunemovenemobamuw.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/10224362391.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/nukimoxutuwanavipu.pdfIn PDF document text
    • http://test-immo.com/file/80017268947.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/29082146389.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca3a6c9c5---romixunumipisana.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/zavafi.pdfIn PDF document text
    • http://surtek.biz/image/files/20150422_023703.pdfIn PDF document text
    • http://citlak.com/admin/UserFiles/file/35317335064.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/99002979304.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/kawebomijofefezaxekem.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/vepilofosif.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/46286421585.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/35610210592.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/wesewisadol.pdfIn PDF document text
    • https://denimder.org/resimler/files/vujafameniradozato.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/34181488214.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/51328975275.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/eca125d392fbda2a3f161a5d655ab930/57601860467.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/53735856280.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_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 18968 bytes
SHA-256: 23c5b85f7eef86dfcf1f92fe5c519a0319a08b5c51a5071fcbd9dde682eaf832
font_01_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E7 10828 bytes
SHA-256: 72e662adbb81b335c4fd6d000fd64b0a42b0291fb4e2fb2a1fbcb05257902284

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