Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ace8e2dd8ed3ec…

MALICIOUS

PDF

74.3 KB Created: 2021-10-07 18:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 06f81cdb9816c649f4c0e4ca8d5b0ef4 SHA-1: f53a73f59b967da4489170fc8a11a9d710670acb SHA-256: 57ace8e2dd8ed3ecf3697e0049ac4c0c447eb14992b3dbebbc559f901a4fa859
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS upload storage. These links likely serve to download and execute further stages of malware, aligning with phishing and exploitation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://queure.ru/uplcv?utm_term=polymer+science+book+pdf PDF link annotation
    • http://munsusa.org/userfiles/file/20210902140507.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/37897531757.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/kikemigufitebifuxobo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0e55d3bef---68469868758.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5gud37mn3ludjsmlg37q4cqgq7/19147386300.pdfIn PDF document text
    • http://timebymtm.com/upload/files/pesegexixarivuxasipi.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/rupufukibuwajavobak.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/fimagiliwixunu.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/jefasafi.pdfIn PDF document text
    • http://iphysiology.ru/upload/bipaserufuraxul.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/xezigotomemipuvet.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139137bd88af---7675054691.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210919192340.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/4742110803.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/refisupazedado.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/vizafusap.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210922222545.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/tujowarux.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145573913b9b---labero.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/zakadajutupeberidam.pdfIn PDF document text
    • http://vtaky.sk/media/file/korata.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4ec8ddf7c---pufepewemirolajupeka.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c14934d9---33796906632.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/tosagax.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/bijawuwikafuzove.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_off0000c310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB27 10868 bytes
SHA-256: 0fd0cf1137d0ad1427c385e2c91bf65ac1db27cdf25d0cedd4e7c047403c0803
font_02_sfnt_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 15492 bytes
SHA-256: 33b2922fde993194a370895264cc37daaeb9db0ae233a7fd3935eb5483cb21bf

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