Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dde44fe0c10fbf0…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 09:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a232ec6fd4d12f16f3cc482661372d1a SHA-1: 7db3630d014dac53ec27c179bbaf9c9ba450cea7 SHA-256: 9dde44fe0c10fbf0e7a08eed2db7fe7b522360c01d0e3c892e7452937c166924
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and link farms, as indicated by heuristics like PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, but the primary attack vector appears to be directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=view+search+history+android PDF link annotation
    • http://goldmustang.com/files/files/98131764170.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/22380903367.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/nuzadikolemegilim.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/totezijuzokivi.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/lovufuvizejakuvakepuli.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b5c41afca---senut.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614285752d32b---40211329053.pdfIn PDF document text
    • http://modero.vn/upload/files/xizibisaxarapodozaxuno.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/70259897071.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/xiwozonekarepaxesux.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144390b7d7a7---51190782610.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/9511718184.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/jogizudijike.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614214d3d436b---96741875700.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/xurugakinanegavo.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/xiliduzotogizudaf.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/47868724118.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/17762882782.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/69195729197.pdfIn PDF document text
    • http://imoroz.by/upload/file/74528104702.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/ralamadi.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_off0000ae66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE66 10592 bytes
SHA-256: 9201251d926dca42a5080840860c8c38e9848422dba2c304734d16665cb45289
font_01_sfnt_off0000c6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AC 16508 bytes
SHA-256: a6cc05385f7c57a04cda1409ad37e53c8136d41458fa9570b8453d9da969131c
font_02_sfnt_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1