Malicious PDF — malware analysis report

Static analysis result for SHA-256 292ad57b248277f9…

MALICIOUS

PDF

86.8 KB Created: 2021-09-13 07:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 596a5107d73760dd712d93eb389c2202 SHA-1: dab1b5474472855516f151a31be136fcecf6f18d SHA-256: 292ad57b248277f959951a78ea31772786a08600e1187d6b3d4fcb4c372a5b08
96 Risk Score

Malware Insights

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

The PDF file contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document is designed to direct users to potentially compromised or malicious websites. No scripts were extracted, but the extensive use of external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=describe+disaster+management+cycle PDF link annotation
    • http://backupcenters.com/userfiles/file/45091134722.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/44605890810.pdfIn PDF document text
    • https://makenie.com/upload/files/77135089470.pdfIn PDF document text
    • http://brenderup.ro/mm/file/40598000559.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/10030735999.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/lugiwexavebowes.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/46171669078.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/kezopolatumez.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/xatenefo.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/34442764783.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2fa8756c9---jisinuf.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/vegedovu.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/93827361927.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fcdffccbae95216290db121363d45bcf/toxukolezajumesigiwa.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/pasoseledededida.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/wevaselegidatib.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/95108645924.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f5b30d8f---mekikexup.pdfIn PDF document text
    • https://auto826.com/uploads/files/xovisabupofupar.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/palet.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138c14fe6b6d---61081795677.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/45756845093.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/wedatiwu.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/79627169264.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/puzadawovezil.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_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 17836 bytes
SHA-256: ca39bba8f68c3c2cdff1f449ee00ac45a01a5349c5690d9996b90a03e485f141
font_01_sfnt_off00011c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3E 10848 bytes
SHA-256: fffe9c73ca71d1d208dd9902f36a86253ef764d421a27f4dba4a5610e79a2ec2
font_02_sfnt_off0001351c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1