Malicious PDF — malware analysis report

Static analysis result for SHA-256 c124a2f4d6c97f74…

MALICIOUS

PDF

83.4 KB Created: 2021-09-08 12:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 92ad70caa0e67171d1cfcb69bcd101a4 SHA-1: 8a7ff6bee8d2032e65dafd6c08374b5a00b39aa9 SHA-256: c124a2f4d6c97f74988543d3bc266b8d9eb19ee274293a92e6dc12f2477e4cab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it is part of a link farm designed to redirect users to malicious websites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=types+of+family+crisis+pdf PDF link annotation
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/11436326803.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/genanolalufosonenuxoju.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///dupogazusuje.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210901033234.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/71430586917.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0976800001619995706.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608362252723b---69896373821.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2e10b2df11ea98254ef88fe08aa2b541/32788218290.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/25119006214.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/57742912288.pdfIn PDF document text
    • https://watertorens.nluserfiles/file/71682843029.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/dasomis.pdfIn PDF document text
    • http://parisplaza.net/clients/3/35/3561a7ce45da2f2f114a98ea6175a4b1/File/dasuzon.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wuzuxirijanijadajumaka.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae867e4fba4---pubabipigigo.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/jd1t97u70p8vvhekr22nmujepb/wuwug.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077dd70f2b05---97787771858.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/vodafupanemiserukoxotos.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16098ce838c726---35914308328.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/dubuvidovumozusakikanaxe.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210610065149_ty75u7.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a49b809ed8c---kixatukedixopisebipesup.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/75253312666.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805cfe5c6f9---tuximonojafimel.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/27896881608.pdfIn PDF document text
    • http://jfe.hk/userfiles/91066302634.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_off0000e156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 17688 bytes
SHA-256: 349e039ed3c0e84f36a3277d5a26d58e808ec55810f8e991d959a60f9d535e15
font_01_sfnt_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 10656 bytes
SHA-256: ef36da23668a4bd651463556161ba51d445f765a445e1d94778105681647f034

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