Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb367fcf5846f65…

MALICIOUS

PDF

78.7 KB Created: 2021-09-27 22:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1eba1bf5482b2d54550222d88a0ce7a SHA-1: 7a0c3581e3df123d84494ab34d576eac2e4631c9 SHA-256: dbb367fcf5846f658117abbbcf6815e450488a55094dafe8c1a1d55d167637ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, some hosted on compromised CMS upload storage, indicating a likely phishing or redirection scheme. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • 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://litho-and-co.fr/ckeditor/upload/files/85248043306.pdf In PDF document text
    • http://www.hon-ro.hu/userfiles/files/81820489951.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/92798976132.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/94870110907.pdfIn PDF document text
    • http://gewald.ru/content/Files/fulewitezo.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/28748200310.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/34358938234.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/lewudamotaxakavisibi.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/34193772214.pdfIn PDF document text
    • http://obrazyramix.pl/userfiles/file/mawubunesog.pdfIn PDF document text
    • http://allycatering.com/userfiles/51359813608.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/24711866338.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/zowesavasafesi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380cc9e2de7---lonogiwaseba.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/87015786040.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/weboxubotubewipi.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/10481889725.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210914135546.pdfIn PDF document text
    • http://hongdacable.com/d/files/24717862027.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/80111295118.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d97d9dd37---gawonevuxotajovuwogerojuw.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/ritufetexapebiwiwomol.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/14729841793.pdfIn PDF document text
    • http://slovoveri.org/userfiles/4647623282.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/11134549427.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614db6202cc78---34393949663.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/28888410030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=justin+bieber+featuring+chance+the+rapper+holyPDF 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_off0000c6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEE 19912 bytes
SHA-256: d5300a490a5fe815021c82a0a71ea2ae36621e2e7725dd32efb5ff3666e0cdc1
font_02_sfnt_off0001126d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126D 11104 bytes
SHA-256: efaa6dba39a19c417eced2966ae249e73d9b8c1e03dd892279bf6e1f5d2377d8

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