Malicious PDF — malware analysis report

Static analysis result for SHA-256 198bd9f6b63f9e9d…

MALICIOUS

PDF

72.0 KB Created: 2021-09-01 10:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: edf04e605cc1f268d3c159b2724495d5 SHA-1: 526b58a52b85f9740dcd82d884239decab01c68e SHA-256: 198bd9f6b63f9e9d3580313a3b0592b642c7410b2db55e032814bff40f031fe4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, it features a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://termocity.by/pics/files/xululigutujovebuvedin.pdf In PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f28ad533156---dibuvosu.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/kipawodawozapuraxe.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/gogakajatunaw.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210503223840191.pdfIn PDF document text
    • http://ministerium.pt/files/59590919054.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d0e327ab90---wojodi.pdfIn PDF document text
    • http://kisikana.hr/UserFiles/files/27730688066.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/fokes.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/zexasuwusofenazekose.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ihgok31ch3ajpf2ug7a6upfm52/wugadagerizelotevu.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/gawajeminipawofixubugo.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/bifatisuseva.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/12847884111.pdfIn PDF document text
    • https://redac.ch/upload/vawajiwuwafozug.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/timijibelet.pdfIn PDF document text
    • http://dejede.com/userfiles/file/lojajunenezufapor.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1a6fef740db7c3309405b6b9ba08494f/74258232903.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f69694f9d4---62684684441.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a67e02b2169---19785159688.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6fe71a07f2c3b0d36de8103a235e1f09/63434898606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=interaction+of+x+rays+with+matterPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0F 10808 bytes
SHA-256: 035807a4d8286667ccce7fb13d3c88e0db0289972442bd44c532524d839559ec
font_01_sfnt_off0000d2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 15388 bytes
SHA-256: c27e85dcef8a1eae80f26607b8c79acc458ed2a9a89bafe77610e8ce5b34edaa
font_02_sfnt_off0000f9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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