Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eda81a338d9e617…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 19:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8607828202f0d01f3523d449df036ccc SHA-1: bc46c5ef26ab403969d4ba0fb0b8b2f28f30dedc SHA-256: 1eda81a338d9e61734768a0a5facf897d56f308ef57324f3f1a9bcac1b022a14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external links, many pointing to compromised WordPress sites or disposable hosting, strongly suggests a phishing or redirection scheme. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.jacenter.org/js/ckfinder/userfiles/files/41187425226.pdf In PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/87160634417.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/robufa.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/74538325278.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/bujogubukuguwuzatot.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e822f96b7a---fizafegodiwijolimewe.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/sanuk.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/rexaweduli.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/sudejamije.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/23410100036.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/n6cl1kotousdh42u59gntak8i5/junetofuvajimalufedipak.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/dakunudakubefo.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613986aea6744---93987808022.pdfIn PDF document text
    • https://bunianco.com/other_files/File/gakidexurirejivo.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/nezosekekelevafubufusobij.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/jemid.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/luwatidowatolene.pdfIn PDF document text
    • http://cobmedia.hu/include/42188538643.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/wuxifatat.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/50447947559.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/pufukijepugepomejov.pdfIn PDF document text
    • http://innotack.com/userfiles/files/kolifojesixuninepazi.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://abwlanham.com/uploads/files/vadixutolativupukax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=electrode+potential+chartPDF 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_off0000d060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD060 10424 bytes
SHA-256: b816be76ae9396d53232ea41c6dfd4940d2bbd3edbcd01703f5de4f75b9bf1e3
font_01_sfnt_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 18100 bytes
SHA-256: 4cc3987bbe0a22d6196f710313ad24f76168b9858206602ae06fba538cff0132
font_02_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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