Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f108254a5152cd7…

MALICIOUS

PDF

89.0 KB Created: 2021-08-20 06:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 942a6b2d987d1f6c29fb2b99d02ed9d4 SHA-1: 8c598efeb8cdf15bf4a3ea8338441fe44beef988 SHA-256: 4f108254a5152cd7a1251b08025db9aa0a62d349b405844bd82e629a634f48c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF 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 it's used to distribute or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9721

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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/89kcojmlp4s0vkogcqq24lrcj7/sajiluxefosi.pdf In PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077d71c7b21c---tivowo.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/wodazurax.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/23385821561.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/pulakama.pdfIn PDF document text
    • http://kco.su/userfiles/file/kuzut.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ffc819779---depufonisijix.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/40021205298.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2efc93eaf---vuxibado.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/xoxoxikiba.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a86dadae8b3---80050985815.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/37023175114.pdfIn PDF document text
    • https://menu2uplus.com/images/file/xogavadigawuzudu.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/kolugorugumilipumapob.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/90348171415.pdfIn PDF document text
    • https://atl-50.com/files/file/zubogum.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/99770344720.pdfIn PDF document text
    • https://aksusu.com/upload/files/83588054587.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/js1jm6g716o43p230pa2tenap8/zopujogetuforotetekajaj.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dba97fe1c97---92580827166.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/67022399422.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d93f1d1525---kikosazovakekafejubazil.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a68750c6e0f---3369753153.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/dg5aod3stm0o3mtt9jkom5gkii/norunobe.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/pufasufigimawomelu.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/7c7b444a84bfa54eb99c5a47dd39a32a/zurimegibatipavij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+insert+the+sheet+name+code+in+excelPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 16660 bytes
SHA-256: 23e7a3fbd2344a1ccc3650ea39b0910701bbac211676bc380b86a7d07a404240
font_01_sfnt_off00010c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C07 10816 bytes
SHA-256: d756ccaa06f91051cc518bd0381ccb6cf4bca96eea7ccb30f26f6a9120a61cc1
font_02_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 16236 bytes
SHA-256: 9f9c9255c0426c77c5b13ef22f4242f4f7095bfd8ba808a20cf1712cd58ffb40
font_03_sfnt_off00013a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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