Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe1208e7beee41c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 01:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23b529674dd004b0c7d8124c361453cb SHA-1: 5c9c07bd4b51f46332fa6c2484698efa1281c471 SHA-256: dfe1208e7beee41c4f6018e8ed13f8bd4d9d8292879c8345e9cdd9b54223a287
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs lead to various PDF files hosted on potentially compromised WordPress sites, which likely serve as the next stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/65e53e8f84920a11f507f53d013611b2/xomexenuwesafajovetadato.pdf In PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/zonakadifekiralegevavazuk.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/76941448731.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/zoxivinetizigexizoxakun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610df01ac27b0---zemowu.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202161332383108.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/f746bedaa2a6c739f13e902c41729bca/51461179926.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086f0f43c9bd---difogarof.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/negona.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/u3idnjibdl2modcejs4oj1dmgi/65245342225.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/dasadezutuvuxi.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/16896930424.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/92439086484.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/7ce0b631a854ff17c0ed1927446e3f45/32330899200.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/dajugikamijebuvofinikor.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/66000092641.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f6f607af4---dadesigagobibatotu.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/xuxofaxo.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/51874534098.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/8466644053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=incoterms+2020+book+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_off0000d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 10908 bytes
SHA-256: 9262903d078e14528045bfa44549f9071ebf89eb149cfd02154920dc7c702e59
font_01_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 19092 bytes
SHA-256: f5c01e27fe622240a3feaf1b60c1c7c628e3bc7a55c9b2486eb8679788374538
font_02_sfnt_off0001225e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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