Malicious PDF — malware analysis report

Static analysis result for SHA-256 e129cc53982830d1…

MALICIOUS

PDF

94.2 KB Created: 2021-09-22 13:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a8fb76c8e347b62a269e2ba3ceea5b4 SHA-1: a573e1de6125e1c56db92a7c7b396cc1299fba87 SHA-256: e129cc53982830d154dac82ef836f615902f202a948765d1361c067a60ab69cc
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 disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://giteduguedesboires.com/userfiles/file/82794919162.pdf In PDF document text
    • https://fratellifurloni.it/file/kotasubukuladi.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/9668961208.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/limigufemige.pdfIn PDF document text
    • http://landpas.pl/upload/file/kewimipawagarogosagaxakor.pdfIn PDF document text
    • http://licausi.it/userfiles/files/lovinonaw.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b55202719d141072906e2af66e56947a/figiwijigotelaturerapu.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/0e489e9e3a745d0ef1b076d03537e51d/vitujavoseja.pdfIn PDF document text
    • https://aitalk.vn/upload/files/gefawododafiz.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/21446641955.pdfIn PDF document text
    • https://viettrungson.com/media/Files/62454361893.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/97568995332.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210909070751931376ggbgc2mwlhst.pdfIn PDF document text
    • http://davobio.com/upload/files/kifekuxojabadebawodimumi.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd9bf23fb---48338273182.pdfIn PDF document text
    • http://cartopack.be/Images/file/53932948949.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/palaxunokeziwogebaj.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/75498599650.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/wigofadozu.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/35176205805.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/bumesudupevimatulesig.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/xoxoro.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/piximomafuzugupok.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/rudavenodemori.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/16146536371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+make+a+fancam+androidPDF 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_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 18216 bytes
SHA-256: 85d46e59af40abc37014f5ec87e677fa76c71ba69a359847c5700f7f28930fc4
font_01_sfnt_off00013ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC3 10592 bytes
SHA-256: b0569e2a344ad21232cf84b8053434f6abc812b9360c9aaa578ef02ba24c2312
font_02_sfnt_off000152f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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