Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f9d9c6b4dadde2…

MALICIOUS

PDF

86.2 KB Created: 2021-08-19 08:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe9285387e3bccc5e710e4a86d01c14a SHA-1: e33a0345edeca4b25cb7df648528a786f052b1ed SHA-256: d5f9d9c6b4dadde25fe04c34e31f03d108b48ab628f85115901ab78e4acf4fad
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://feriaalainversa.com/uploaded/files/90576370780.pdf In PDF document text
    • http://tlxzkj.com/uploads/file/200840413898.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/42964946388.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/72163521881.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/19857989644.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/25266625670.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bac86744e96---kerer.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/medobuk.pdfIn PDF document text
    • http://renovator.cz/files/file/8001098353.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ff36fc8e08e4d5849cc064dac7fdabff/49526801270.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/xudodatasujosiselano.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d58ef3293---tuvumunalasomeguxaju.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/tesozigutazetinefimus.pdfIn PDF document text
    • http://orthopediedelft.eu/files/82185064406.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/994be655b7c53039f2f117617c95f5d5/venezibosoroma.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc85b65874---jixititejezuzamikojixuj.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ro8lij3ch0k7t7j3nduqdcl065/zuduvadikuvabeg.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160779d70c4dae---tufuvelopo.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/fevamawigavizaduzajuxabop.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160760eacd833f---9900733135.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/zirexuvitipozimizujakazi.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/sumejavoduf.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/14562519349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hop+ball+3d+game+online+freePDF 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_off0000ebc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC0 10876 bytes
SHA-256: 5e9195db30784e586ea4036f4b8ae90f1aa407b789919263acb447232ea21006
font_01_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 18048 bytes
SHA-256: baba14025318a499154e34bfcd218dd68431ea865c0426d5a35dd77e0859d8ba
font_02_sfnt_off00013342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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