Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcaba12a743ce7f0…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 05:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 67ae38ffbda574731e770f59d9e7cff6 SHA-1: 6f9b59427c1c30d81a98d41142f831db3447a331 SHA-256: fcaba12a743ce7f07b0899d38f829b543dd550fec512f13e54cbf6fcd7fdba19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. This suggests the document functions as a link farm, potentially for SEO manipulation or to distribute phishing content. No scripts were extracted, but the presence of multiple external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cructi.ru/uplcv?utm_term=cs+1.6+cheats+wallhack PDF link annotation
    • http://extrastyle.ee/ckfinder/userfiles/files/nifiwotunuvoliwana.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/66562561318.pdfIn PDF document text
    • https://uangraja.com/contents/files/geponujoluzavugeluzadana.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/11317222772.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109011312234614.pdfIn PDF document text
    • https://digireg.nu/upload/67417286256.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/rakorawapakeso.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a271a017---kokolagewa.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/84038960869.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/janigukibewames.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161366afc3fb58---fisowagetudeka.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/422807092.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/75988583821.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/rupixalukukoluboj.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/02bd9b9008c6f808584b77e3d6bace63/9969069103.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/gibivoxevibidiruxedoxeb.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/xowanizisekotigibo.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/3446073889.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/puvejijufadod.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/89254281869.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/vurafimasu.pdfIn PDF document text
    • https://simbotour.ro/ckfinder/userfiles/files/47473023374.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109171646274671.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328a765526d---gazowuzuwivep.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_off0000c6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E5 16912 bytes
SHA-256: 9f39a00145230f36b8bff864dd48b85722071a3688c9a9edb28f74c9d8ebada0
font_01_sfnt_off0000f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 10404 bytes
SHA-256: 4acb4ed0b0397a091818d64de924a24ba37cfece011feb9a3a5ee282ee6dd8f7
font_02_sfnt_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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