Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f8f071577a5f45…

MALICIOUS

PDF

98.3 KB Created: 2021-09-06 16:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31addfee3655100d680ff619d9e57b9e SHA-1: c86d56866e2d740de161d1c4ea7bb2b3f549ae2d SHA-256: 98f8f071577a5f45e9d13ff694034ab6975eab2bc9b35dc3b8d31d20e5b29d83
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to domains that appear to be compromised or disposable, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a phishing or SEO abuse attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://aucoindeshalles.fr/menu/file/58911616448.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089846a46d19---kodojitexilul.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b09191c9af---dorebive.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/zaligakulozebitatekenanor.pdfIn PDF document text
    • https://airbays.com/userfiles/file/lekolet.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/malipopumemasareraxob.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/zitopizes.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098361f638a2---99264427660.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/35939608729.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a409cf6ac---69786817647.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3adb10579f---rolaxupunese.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16112ea4074bea---rorenitukinebad.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/11827063076.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/n779lsfnhh4brqn680shda60j4/pawabavalepirurudif.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/92430185294.pdfIn PDF document text
    • https://noventa.cz/media/files/file/fetirewaleforovarowezizi.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d2a1ff44---buseziror.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/famivuwedirosewatomagosi.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/mukexesufuvixamo.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/gipulolugenelukazavoja.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073441815cb5---243349015.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/zaninubivusaguros.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a596cec65e8---79833312853.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/gimuwinemuwolamofit.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1627617507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=human+physiology+pdf+bookPDF 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_off00011d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D88 11052 bytes
SHA-256: 953418bdf841b1c781930bd82386243e38080bd09f78cac5d4cca25a3cbe61e7
font_01_sfnt_off00013688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13688 17396 bytes
SHA-256: 3671d4e49212c918db3f1d61aae38a7b4d8fc39f008efb1a22f46732fa402ca0
font_02_sfnt_off000163ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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