Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a1a030e2ea6606…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 14:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2389fe37c66e7a4647df3fe3670cbe46 SHA-1: 695032ad9adcd444b6d6f00adf3faa1229264045 SHA-256: 81a1a030e2ea66065e29a4f1bd544a2d35297f95877463804ce048af31ca7ed4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://jx4d.com/userfiles/file/61022716103.pdf In PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce3d567b3e---texetuvutevurasirezaxusi.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/wetolajujizokanikepe.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/8379333613.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/wewanimoripizigazuj.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/ninagegagetobos.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/mogaveronosixebivodugo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7b41d53a2---kotejobomiku.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/gvmoda8nhrh9kc5m3v78f328no/tonadofatijumusamarixu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ffc62169e81f84cbb06453abfd3c4175/zetagisas.pdfIn PDF document text
    • http://abwessex.com/uploads/files/xitepunina.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/selikoxofug.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2td5savcfe16ug7d0u2dnctgfv/84871890800.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/517f11f26bd2b82b80f774fbbaeebb0d/sixugugiwanali.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/23325054143.pdfIn PDF document text
    • http://learningkey.org/userfiles/16988338867.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16071d67d90628---wozivonosarazek.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/73738480447.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1982231004610975ea1a0a8.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sejetisaruf.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/72979972319.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0804/94e6fd245d663850f5634c3ae7a1562a.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ricoh+gr+manual+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_off0000cc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC82 10812 bytes
SHA-256: e8fa0b6d4f3b159373f7758f3cb1729c8bd6111bdbbc6016e9d756fbe5e03605
font_01_sfnt_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 18608 bytes
SHA-256: bc3f1335f3399a571a70904cc7e413c5d647aba6eb1bb5ef99e41580a42d64c2
font_02_sfnt_off0001159b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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