Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b89367200543a4…

MALICIOUS

PDF

96.8 KB Created: 2021-09-22 15:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f87c08b89589a5f9ff98792d33ebc452 SHA-1: 655c6ad35fbadf889dbc6ce2382f5a160d24c596 SHA-256: 09b89367200543a42c11c042c3030a9239adc13f282bd1a1aa7f8f89297cd6cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://irlanc.ru/uplcv?utm_term=the+complete+sherlock+holmes+pdf PDF link annotation
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613103f5e9d73---15592099435.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/lazobajufive.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/19817950749.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae968520db---63728758121.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/jegurupexu.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/fiwumefikikewaweba.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/bekegoxifemumejiwane.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/68832228696.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/vebepikiwudogakado.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/pimigija.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/7918005621.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/39613442072.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/xezivela.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/niwatikivisi.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/jurabitidekexujefaxi.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/rajedazulalapasalidum.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2d773319f1761058065e5fc0b88c0967/kixubifi.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/kelivapojatudez.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/xinirojevesifazusubusav.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/10590607834.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/51233667707.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/92971422756.pdfIn PDF document text
    • http://xtra360.net/campannas/file/98589892695.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/xafetisijusisesapazuri.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/jubifimaf.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/21926520284.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_off000115cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CB 10584 bytes
SHA-256: 04b6e703b8dc251e49a561bfd92502e835bdf93e7db395b2963174084260fb24
font_01_sfnt_off00012dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001460d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460D 18112 bytes
SHA-256: 25daadf53d16fc97d77726f635b774f79ab38e7e9e64d60359f7698a397bdc59