Malicious PDF — malware analysis report

Static analysis result for SHA-256 5391c97a53af8410…

MALICIOUS

PDF

92.6 KB Created: 2021-09-15 21:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae218e7344ecedbdead280cdb8aafa91 SHA-1: 1075c57d56c8b85ba847dc04a54abb321514056b SHA-256: 5391c97a53af84107240c1750d0106cd73f487e9618c3ca87b31a17b82a890ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gidaero.com/upload/fckeditor/file/49647319662.pdf In PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/dafitu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jodasiroj.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0a98d14af6bae65b55980897524efd39/tupotefibopukowezasimala.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/bowuza.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/rovukukunomuvapomamus.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2275238393.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/kovemugidugi.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/61grpd0qqtrivgh1q762giklut/regafidosozulerosogasupef.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/pelarukofozemulavanatek.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/ruwedir.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/82508745348.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/pufujoxupufis.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/05d81nol56rsra3e6333es4uv3/33995255183.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/pomomegiwu.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/69810191544.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/xezaduberuvoni.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/96251176996.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jaligezuxepufira.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/17539941730.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/80846450772.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/wisarakamoloduxipozed.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/15041390788.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/64a8d7267c90ea534961fe8a061367fa/raxugokeduwuguxe.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/31578793985.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/76464152304.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ce6c0ea58b01e178b1821281ea3f2bed/66416068113.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/97232395845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=my+little+pony+app+game+cheatsPDF 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_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 10828 bytes
SHA-256: fce2ffa9c1307a6ab6295546b7f947e0e25cc61c46a04bade7083c806cc0ea67
font_01_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001328d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328D 18856 bytes
SHA-256: 45c667ace1cf0174d284fc3b073f5938e829e658a6fea9cbbfeeadae5363aa71

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