Malicious PDF — malware analysis report

Static analysis result for SHA-256 1649ef7a18e00ef4…

MALICIOUS

PDF

86.1 KB Created: 2021-08-01 01:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2da5f6abce7ba4c2b5d760c07f60c77 SHA-1: ba51a56f46b4af2dd96af8418425cbe8a532313b SHA-256: 1649ef7a18e00ef4a805cb312fb30d46b5baeaf4d74712198695d6d5271e19f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b77abb01a---21050626855.pdf In PDF document text
    • https://powermailer.in/userfiles/file/8646393512.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/35533036160.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/29cbe0fcb5b6c859e1b17ef2af7f728e/89236353653.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/kogebifenatepudil.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/1427265704.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a4d9a2fc---xexoborako.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/xipubudedutipuramukofa.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/rutifupodozirajumi.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/79946324186.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tr7p95bv88jv78uag9d0cdveo5/99592841649.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fa9f879ab---fenupatolutonekap.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210615_130714.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/12680397727.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/toviwijejojavi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/cf59b7b42fbe0dafd6ea32c8532def1f/rinukolaxuguxipazexux.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4ba597c70---pelas.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/sidami.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c54dff474445721f887c5851c0ad0db7/mufedaxusajibagafi.pdfIn PDF document text
    • http://poorclarescork.ie/images/59572925783.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e4a56f5a---lazotizez.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4ff724caca9f670c26b0440cef2ffbd8/danovosisufaposexan.pdfIn PDF document text
    • https://cubic.is/userfiles/file/jilupiwaxamikuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=abecedario+en+cursiva+mayuscula+y+minuscula+para+imprimir+pdfPDF link annotation
    • 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_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 11084 bytes
SHA-256: 0434795146d6536a8a36f3b7bd84665b16f34ae34619c0d90f21c20cdcc8fc9a
font_02_sfnt_off000119a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A9 18260 bytes
SHA-256: 8fb4d1c5c7d7594d517d23d8d0188f576c6c3acab77cc444d39c7933800f0c92

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