Malicious PDF — malware analysis report

Static analysis result for SHA-256 e583208bdd954f10…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 04:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4f773d7e6b332f0db803e48a3151f85 SHA-1: 42b4ef5dd657bb11044ffe51ac8d8de1d9f96572 SHA-256: e583208bdd954f100b3b55f668c3151c07888e59a4fd4188e1ffc7b37f5b3e35
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other 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 strongly flagged this PDF as malicious, suggesting a high likelihood of malicious intent behind the link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pgp-puh.hr/fck_media/file/90665322266.pdf In PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/pibozewufupugab.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145308686bae---29230498165.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/75747260560.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/49668782433.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/49827465926.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/33238394973.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/mulamefude.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/takalenanidugilurafaron.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/29714749513.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/33832262955.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210910004703_klhl6l.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134cfd64bd0b---61222049009.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4308e44f7---xizuz.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b5313f968---porixuji.pdfIn PDF document text
    • https://panoramabyty.cz/content/62743146026.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/waxolovomububodarudikos.pdfIn PDF document text
    • https://designclarf.it/file/sowavefat.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/58476779417.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/21423167684.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/8681295497.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/foloxot.pdfIn PDF document text
    • http://chikatere.com/Upload/files/69988438030.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/34014976430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rich+dad+and+poor+dad+pdf+free+downloadPDF 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_off0000d797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 18844 bytes
SHA-256: 03ba00269116295edd155d06749bf699707907ba31121f9654eb7ea408774b3d
font_01_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 10584 bytes
SHA-256: 485f7066c2d556ff7721acc3f3ecf5001cdad4ad74d89cc9a8f000d3431aafb8

Open this report in the interactive analyzer, or submit your own file for analysis.