Malicious PDF — malware analysis report

Static analysis result for SHA-256 176135db168d7863…

MALICIOUS

PDF

75.5 KB Created: 2021-10-10 12:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eb2781ab107049b4ec9e64038e0f266e SHA-1: c7ab2d42be90feecc3c5e74c359c18a1fcffedce SHA-256: 176135db168d7863e5938bc9e646cc8254babe697fb43441a2fad3fe90723129
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts for a link farm, suggesting an attempt to obscure malicious redirects. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://martan.es/cenavarra_userfiles/files/15555965778.pdf In PDF document text
    • http://svazekobciorlice.cz/userfiles/file/tetulutuxe.pdfIn PDF document text
    • https://lesura.net/userfiles/file/zinopidutadebuzij.pdfIn PDF document text
    • http://lovesenergy.com/file/27197173023.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/bulelegifodibuperekifu.pdfIn PDF document text
    • http://zaiger.ru/img/file/nenawufexibomepesurobuvod.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/rubajomifidukulolojot.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/4304658475.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/tunidakuzuguwujakudipus.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/76596689181.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/28642234754.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc7347b00---88727624219.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/xogibusebiragipilu.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153f10ae8737---pumitisesubovilawim.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/31301044129.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/28222518536.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/76457480356.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/situdilenow.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/tirib.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144642d23cdc---66204916574.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/lifuze.pdfIn PDF document text
    • http://chinahongji.com/d/files/63638802271.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/muvoguvuditegegapewuxa.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/vojoxomojalaxu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613018c7bdf4d---14270299238.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/2502963987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=montgomery+county+youth+centerPDF 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_off0000c3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 17444 bytes
SHA-256: 60ea4c23d0080d1df9e6a7952b2486ec17ed89a73d0f91e396cd07c99b5c3435
font_02_sfnt_off00010919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 10416 bytes
SHA-256: 1f8303f1e42da0c546bab9256bb87b529defa58c0c8ad0ab38434db2dc210e2b

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