Malicious PDF — malware analysis report

Static analysis result for SHA-256 e614d41ee240eb9a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 05:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 97631c3a4ff028ac036e5e4b619f4cf2 SHA-1: 1880c20415c8f7f1d856a7a0dfb255df252bb2ea SHA-256: e614d41ee240eb9abdccbb2a998b4c805942f28b22936b6e2efe9d7e24845747
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded JS suggests potential for further malicious activity beyond simple link farming. The document's structure and heuristics point towards an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://catamma.ru/uplcv?utm_term=brian+goetz+java+concurrency+in+practice+pdf PDF link annotation
    • http://dothi.info/images/files/bawirikesufoxikotomumokof.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/gidinuxagiru.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/sumatutejeren.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/24156578581.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/lijofa.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/nutipeg.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613019de1715a---64341630193.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dac3a3ea11---zixokug.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/mezuxibu.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/govaxonuxajiw.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/fopozez.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210910195115.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/96537387509.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/51232483719.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///91938002880.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/jusid.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/29522518357.pdfIn PDF document text
    • http://poliinc.com/upload/files/mumefisopadizef.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/mudinowixepe.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/valerunumizugewa.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/33072432793.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/66393013577.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/61920408539.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/28f215f92f37df106c45dde0ea0de11a/47885011669.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/forerodejakawe.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/faparazegazotegakebotup.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_off0000dc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 17784 bytes
SHA-256: c26dbc4399e7b471050f89ac8a899aef2fa8e8b139c6cdd9da5a23f8d050421d
font_01_sfnt_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 11104 bytes
SHA-256: 59974d23f429339c551d0269af371153a74d21659948301e2fdecf3a9c7d7cf3

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