Malicious PDF — malware analysis report

Static analysis result for SHA-256 267219f72b40850b…

MALICIOUS

PDF

88.6 KB Created: 2021-06-28 19:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a99e35a555b3d2d8318d20c1d8f59c26 SHA-1: 852a2cfd5f698dbd11c74816d8d1b5b58c04a221 SHA-256: 267219f72b40850b289cb10acf82c74b654d39ae35c14228c1279df1184b5f31
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites that host further malicious PDF files. The presence of numerous links to compromised CMS upload directories suggests a distribution mechanism for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/pkb6dj5h54m6bs6krt37b8fvc3/25218749545.pdf In PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f37f1a669---dukotuxitevorodosev.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22ac7b5bc8---dokudakox.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c74c804114ae1f10cfb4b5b0b2dd66b0/79889810476.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6b4eca76f---93408844267.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/kipijuxibetep.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/93bdc39c2faeff52e105733a50122c1a/wurejubadur.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/48272011299.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/d90mo8dqm0skj5q053j70ig3nv/50278501953.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608657c233edf---ruduwuvutalomabop.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/gu6v3s8on2bvj788kl8cgg8ip8/37104073000.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160848d6aa3890---55154145615.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/movofefamerotomovejab.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/118dc28513931691b275d40afee0a28f/koxax.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/8d8930971b5aaaba0223e82dca7f592a/8650345706.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/tirirasilolekojojozu.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/88607428759.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16088ef7288fef---90494111014.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2a27e6cbb---1305191955.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210621102541.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/wafobumojipinotepobofopux.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb3d916e83---joporamopobipujinovutu.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/90701840888.pdfIn PDF document text
    • http://teplospectr.ru/images/files/zefitovevofekonadisem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=going+to+buy+a+book+class+4+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_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE4 17724 bytes
SHA-256: 5178715ef622312194ce3536a27412aa07ab8b619b4213aafb06efd22dbf43da
font_02_sfnt_off000139d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D6 11128 bytes
SHA-256: ffed71dc6790f29cacf090050c9453722dbaa5c8bc09264f794ddfdba26370e9