Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d0366c24a9a3d7…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 00:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35c8f058a6f2a7641b7a6db0208fdebb SHA-1: b98039bf11c34aa21a06b553773868a12a40654d SHA-256: d7d0366c24a9a3d75de23d0dbcd56e41e388c1caaeebc3af7fad60b02a0463b6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS upload directories. The ML classifier also strongly flagged this PDF as malicious. The primary purpose appears to be redirecting users to external content, potentially for malicious distribution or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://oniceh.ru/uplcv?utm_term=middle+earth+strategy+battle+game+rulebook+pdf PDF link annotation
    • https://nmg.lv/img/uploads/files/fizilax.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480a59cb68f---32493878375.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/geberaxub.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/83633250297.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/nugisig.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/57582470618.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/44049390608.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614153c790471---nadalalirexobizobovuge.pdfIn PDF document text
    • http://skncn.com/u/files/ropanurotapem.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1d28b14ee---lexudikom.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/masinilipedexeronob.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/jepegewew.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/22561840078.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3c824a200---dezifaviwavus.pdfIn PDF document text
    • http://elpijisystem.com/file/17330273396.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/zotigapumutotoxakafe.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ro7u25top2ou19g34ua54h03um/zoxexufelexu.pdfIn PDF document text
    • http://kleiberit.ru/files/file/22554137031.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/98464743996.pdfIn PDF document text
    • http://etnorom.hu/pictures/68261515594.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/miwubuxufuwutajuf.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_off0000ac0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC0D 11280 bytes
SHA-256: 41cbabacd5f49434417e82e4cf6189b89b005646b9775b8c0b0370b7f8261be4
font_01_sfnt_off0000c621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC621 15952 bytes
SHA-256: 6228b7e31c30c9231f239dd11baf44c7e552ffcc205c92310ed64353448cd74c
font_02_sfnt_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1