Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de8e86f6111417e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 01:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d7f3054fe7ccd5b599a0820a6e0c33fb SHA-1: f1a26bacbe0b8feebc650da2918ffc952b9bacee SHA-256: 5de8e86f6111417ed72ea68ea1d63e6bdcdb6176141cd43a9d70d553bda576ba
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The ML classifier strongly indicates maliciousness, and the combination of JavaScript and numerous external URLs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=printable+cm+grid+paper PDF link annotation
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16140251f9bd28---laperuxakakulaxofivijaxe.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/fd5bdb1278a22f47097408c95925822a/poxufomivenomenimaz.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416124c2fa6---40412082591.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0d36924a4a251e94f975333a8c663f57/30599630905.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/nikulajederekarop.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/muwuzejepevamukogatuxog.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/nutafegofa.pdfIn PDF document text
    • https://labelmarket.pl/data/file/junukovipekebiru.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/75816886526.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/xabaxuketakeg.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/19386328367.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/zirobusanokudonipi.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/judutumolo.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/betimotu.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/kebufaxapamigepafo.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/76614401229.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/87694217348.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/9367819696.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130e95cd5ac2---wesosafazomobaduz.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/91451800103.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/wipejusatexukitobebuwogar.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/8147440157.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/linujefunis.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/zolip.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_off0000d802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD802 16948 bytes
SHA-256: a50d4a5c3285dc9ab2760fc74f3f9bcba7a7d0d59ecd5ce7bf2bef1d6297b4ca
font_01_sfnt_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 10712 bytes
SHA-256: 46bae782c95da3ea1a6540253704c4ce0d5b2e15737526588af1c3c5f143a0e6
font_02_sfnt_off00011b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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