Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c36c8ce840e178d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 00:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 860c14366dd3910b7ed4031a6f6c74ce SHA-1: 15f89c7aab65167a92511b28c4b11453fcce5709 SHA-256: 5c36c8ce840e178d3d94895553d2bf5ed995dee69f9efab2aecfe17d032f04f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://huntic.ru/uplcv?utm_term=bad+genius+english+subtitles PDF link annotation
    • https://dichvuketoanvn.org/uploads/files/71398927951.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/xebojez.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/83476344792.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210905155440.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/kiladotebebefegufovejopi.pdfIn PDF document text
    • https://eternalbliss.net/file/tebokujonuwagilifod.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109012106529087.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/zulofinaxibejurixake.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/62337615127.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56220190014.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/samotomaves.pdfIn PDF document text
    • http://live-net.it/file/jowunurenuvo.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/88784718167.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090912304992.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161410bb27f82d---91291814189.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/46790011586.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/46378559283.pdfIn PDF document text
    • http://retailcop.ca/files/31292933727.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/2245347078.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/46528944508.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/7ae3c0cbbf64523cc3cfaa1dff9fd5d0/kumusesejugikitibonep.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/tumor.pdfIn PDF document text
    • https://pindimana.in/uploads/file/36947620135.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/vikajufipatoxezupem.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/wesunugivufe.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d3644b48---rodelixoboj.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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 21640 bytes
SHA-256: 1718d3b3ac94068b257e38169dc420f9a9586058b927af69303caf2123f98df7
font_01_sfnt_off000114ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 10600 bytes
SHA-256: c2435cb37c48c990ea3c7ec4248652d5d20e4065cd1c47356baad84212f0fa44
font_02_sfnt_off00012cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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