Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd2f1a15252ac22…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 13:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d71df90fe6d2ffd7c2405b35285667b9 SHA-1: 2b1785f829e4154cb5a9f09f9c788441991a6ab7 SHA-256: cbd2f1a15252ac22db0d7f116ee6ca37df4bf9d88762ab12893c1c3cd39f09a6
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some URLs hosted on compromised CMS uploads. The ML classifier strongly flagged this PDF as malicious, suggesting it's part of a distribution or phishing campaign. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent.

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://marblobath.com/app/webroot/img/files/ropagitagekuwisifanelejam.pdf In PDF document text
    • http://taaltoetsvo.nl/userfiles/file/limavegatavopo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cb1397aa8---67764531645.pdfIn PDF document text
    • https://iohrp.org/f_files/files/lapovonanawakizugedega.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/futakuvonelivixorirogiwa.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/rizinavapimurazakoletum.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/kedidalogasunakijexasun.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/mutelovimajezaja.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/fujer.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/15361086769.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/gutobarupadez.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/rupolazumunumutupefe.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/digow.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/102a425dd4b811d7abe1cdd69f2ca9da/29577873352.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/73064538159.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/pidevimemegowaxix.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca6d9dede3---41009386478.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/tiverojafokudubasad.pdfIn PDF document text
    • http://hydrem.ru/images/file/92936149592.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/fukodegaz.pdfIn PDF document text
    • https://85097781.com/upload/files/zetovedazipove.pdfIn PDF document text
    • http://podarox.ru/public/files/tenitogerurutoveken.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/pudoxalujenosev.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/84711677883.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7ad35cfad---nemojijuguxudalade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=5+letter+word+starting+and+ending+with+bPDF 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_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 18336 bytes
SHA-256: 446421b6a79e5a287e2b717b86f5904e5bd13d84a4aa9f44c2a0e120646b5708
font_02_sfnt_off00012873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12873 10788 bytes
SHA-256: e2cf7912cc2522ac809e1c7f57e698282e67e5afe43252133d874f9861b0dd0e

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