Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e68e6e9c05dbb9a…

MALICIOUS

PDF

71.5 KB Created: 2021-09-07 02:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ade80c4fed1a82a3df3f2fa2c0199447 SHA-1: fda78d4b8365e5a14c47a7c448aa20ac5d222805 SHA-256: 0e68e6e9c05dbb9ad5e9e6f90afb90039765cd75a42ccc08145c16bc10e82e35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://china-baby-clothes.com/d/files/golararadifojejubidireru.pdf In PDF document text
    • https://peiitw.com/Upload/ckeditor/files/guwuwadexog.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/97c372487b0a7776aacbe5ff002765cf/futepivu.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/amlp62hkmvtih0sjeei36qit1r/wapozomerugetonofujuwope.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160af0e80af4b1---zakisoxazuzufixaz.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/44647686274.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210820090230.pdfIn PDF document text
    • https://smaransaving.com.np/ckfinder/userfiles/files/nenogadojoj.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/57958092949.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/u0bb7hubmrqhdn5covn21psou0/xudunagegagigi.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/fabazugurovigojodezakulud.pdfIn PDF document text
    • http://strandedtattoo.net/file/10354075232.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161052c5879cc5---najufalefexexudovolaz.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/89706254869.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/wirutowikekopus.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/8538954920.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/22448014969.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/kexadanasetowafetamut.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/3256a7ebf4a25b791713ae33a30d661b/nifagugubedenutewaf.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/sedodemokijexeberupipel.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/bcelfoqu5bdpvvuetingk9l8l3/69417500998.pdfIn PDF document text
    • http://ledins.lv/cms/file/lemarupawalumivomajazo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bdc88ba77---bawajof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+convert+pdf+to+word+using+ipadPDF 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_off0000b5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD6 10992 bytes
SHA-256: 3691548bde36daf4f4d4312e27fdf7af39d9e67eaf90bea32269978aa71e06b2
font_02_sfnt_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 16016 bytes
SHA-256: 55967b0ecf6613c037a80f03784fb6d3475f29db45dec9e62b9ae1ec62dcccd3

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