Malicious PDF — malware analysis report

Static analysis result for SHA-256 c048080addabce9b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 18:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 462338d1e8f5ca979583769c39fd0656 SHA-1: 2973b59b137ef953e8840b914561686c455d918b SHA-256: c048080addabce9b3345ba65282ac274a07aac8dcc633d85591d865245c4fed1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were extracted, the nature of the link farm and the detection names strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=psd+to+pdf+online PDF link annotation
    • http://gaziogluenerji.com/images_upload/files/kifil.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/18582429017.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/16396260725.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138387dc7ead---63168487305.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/xogijalanabunoma.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94af539da---bivegoxu.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/dagapejenum.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e6acdaa79---36710037200.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/50523494471.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/dinefalisa.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139467c9ddac---vawemikalabav.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c5077a8d234da418d3c95c994e872578/59589684698.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/zezuf.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/27482593401.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210902030347.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210911002855_kzgy14.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/romupugapodefogox.pdfIn PDF document text
    • http://kaies.cn/upfiles/210910045935765464rshng4.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/xowovuvewazopivekovok.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/7714653640.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/32459414049.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/46465476692.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/eb8611c97ffee7ba6751ea1532559e7d/32595009102.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/36075330318.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/puburakivutorito.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/sexetejaxurinevugakaviloz.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_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 18564 bytes
SHA-256: aa96762799e2d7d31c20f73eed1c4dd8dd1ba32d07ceda9bd18375ed8afa7c88
font_01_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C34 10228 bytes
SHA-256: e281243e18e3063bb70f7e69ad150e66c0ce81c95093927764d78aaa314d9804

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