Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9a86ab8e125836…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 15:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2780d9d9ad4d422717c8ccc4a800ce37 SHA-1: 87d3402d294d20ea1e439b0219cf6a0f171e8957 SHA-256: 5d9a86ab8e12583632fcef9300df8c061803a2a6ba5af3e05865578cf2aea024
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised websites, indicating it functions as a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to redirect users. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=pray+the+word+of+god+scripture+prayers+pdf PDF link annotation
    • http://eko-uklid.com/files/file/fenolevepol.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/palekujaf.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336a0b92bb1---sumofufemedutenonubibi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7ec99409c---16868906695.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613517d61efbb---pujuwubujuxokoxuw.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/pufufopaviwadizolabonomet.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/33837452392.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/purigikobekusuv.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/56129092912.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/55512690788.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/guwasap.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/38115300743.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/zalivovaris.pdfIn PDF document text
    • http://ranch.pl/files/file/zonok.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/63844228761.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/gafodejimozedamu.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090716435973499.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/69725850989.pdfIn PDF document text
    • https://panama4d.com/contents/files/kukatolirobuteg.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329a79573df---58568174403.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/mowirowijedubuf.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/javupotuzorafeve.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/pufimor.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/74332581566.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_off0000dd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1C 11048 bytes
SHA-256: 8763f63c0f958634d4f3d66856bbdc76a8ad2efb2b3a58a68046d367b63f9af7
font_01_sfnt_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 17688 bytes
SHA-256: 2de158e690fa4acea1a00de5ce639396427b933ccd81460d77d4826a0bb0b6f4
font_02_sfnt_off0001248d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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