Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f54c19c16166f5f…

MALICIOUS

PDF

90.1 KB Created: 2021-07-06 02:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e9db3b12dbf39e8b2d796dc4e66fca9a SHA-1: d3f47d65cf9fe4cc010186a88e9e65a8eda851c2 SHA-256: 3f54c19c16166f5fc8c5593dbd21cdf5d7e5a03d1ed512779e70503a7050c2fc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. These URLs are structured as a link farm, suggesting an attempt to manipulate search engine rankings or redirect users to malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

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://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4fa86519903550f016ca56fb2bb81dff/7652824231.pdf In PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/cemtq61t62jj2ma56bdel6t5g3/53996078895.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/q3kf326a4a9lrmait6u73achrj/dunoxubuludotemubamo.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/dozipupuwixuserokidip.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf5392414d---mekene.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/5m887ft75h1j6637i6fndbqll9/terasiledaluduwidofawe.pdfIn PDF document text
    • http://cke.hk/userfiles/26872248525.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/57687552719.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/9hhp5dtk8b1fu3is4eissjruo9/gasomodalo.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/7809626805.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/962fdbf35040ba53ddda587d9408e1d7/vipugadiboluxetoxoluj.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/509771234f78678a077c7ae1f829f90a/32620338214.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/jofawafujaxodimevugaw.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9c932fa29799b7b9f5a50a2c05d7f68e/46614510107.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/wanibafunizulimo.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090dd431ef72---volanejadamibo.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f1c088a87188e5d98309187a5217c98/40270094921.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210601021537.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/birugajol.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/045c8b5d3491e5623af8841551bf7318/68591646935.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3f890c9effaa81ab541353d94f5f1351/jusixizanu.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/lowarokenixepiweb.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/20941636045.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/kisepaxilebofevedaze.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8abb480f6---85593357225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=chemistry+form+4+textbook+answerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 11076 bytes
SHA-256: b216b6042cc7e78dd2ffea19b834d1c0b7b5bf1eff40f9f265898ebde4efe2b8
font_01_sfnt_off0000ff5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off000114a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 17400 bytes
SHA-256: 13b917598c84daf3d4014310994bf780efc7158d000939ed802e96fb04b2e0a2
font_03_sfnt_off00014249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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