Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9615d4fe2278ff…

MALICIOUS

PDF

98.5 KB Created: 2021-09-02 11:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a8f54e011666a5f7ef75dd9ca8ba3a3f SHA-1: e4df58f64da191edabe99f1b17a385ed68e3ca2e SHA-256: 9e9615d4fe2278ff2726dbbd5b670a9f201c3c8148fe3c36882933688b383bc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://tskrea.com/userfiles/file/98367010119.pdf In PDF document text
    • https://smilaxlabs.com/userfiles/files/setezubaganufewa.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/56ak0h9sf9hsg9ovp76sev55se/89502589810.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/sbvmt9g97eo5shj01umdoec6fc/43066309995.pdfIn PDF document text
    • http://kbchina.de/upload/mozediruxerobukovulota.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c272b749a7---moginageko.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/86368424292.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce151a2341---valewijiw.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/o2ru3ipeq48lv2g99m3imve7n0/73104887233.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/61260549189.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/17394078692.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d47c184a1---74564372803.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/48230989549.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/fasesobavavozomivorupimo.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/8076989842982485a02914dfd4f562a8/1139313227.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d68c1f38a---fusegabogogalatatojefek.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vrph8bvbesqu0uerpqk4cf3gi2/fadasuvuxituwalekutosakop.pdfIn PDF document text
    • http://full814.com/upload/files/69271818704.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/gawolijefuxomunu.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/38017230717.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/23965747111.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/53602643758.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/31663601271.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/3db3777b5a13d6fd2d08764c744fd187/lofokimufina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cbse+class+10+history+chapter+1+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_off00011a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A63 11072 bytes
SHA-256: f28595a2fd9ea9d2649521b4ab67b0e885a6cf66646b3088d8c2535370a00a29
font_01_sfnt_off0001342c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342C 18636 bytes
SHA-256: 563816da7536c012886814568dec9305efd235bb94bd0b8d09cf20af61e8b629
font_02_sfnt_off0001644a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1644A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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