Malicious PDF — malware analysis report

Static analysis result for SHA-256 9732e0506a68c387…

MALICIOUS

PDF

84.9 KB Created: 2021-09-08 07:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 225af7ef8d5938cc50070598b7c36d07 SHA-1: 89b3ada17865bf3bd8a7ec2e78649b8575a8bc18 SHA-256: 9732e0506a68c387ebefdd215a6a4bd8b3da5b1e1eed2af7096ddd39028b9fb8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. The presence of embedded JavaScript, although not directly analyzed for malicious intent in this report, is a common vector for exploitation in PDFs. The overall structure suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b2923a30---tuzixaxefomefeperigaba.pdf In PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/64832244043.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/gilezasixexokanimifejer.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/60715310821.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/tixababoratolunuxop.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/tujewisemipuxew.pdfIn PDF document text
    • http://potlista.com/file/files/fuvaxanom.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160769294a5c1e---42851268317.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092e4e976e2a---tolala.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/40439672233.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/dda3c78bbf6b9dc78f1547acafa55b45/sewasekapisajejawig.pdfIn PDF document text
    • http://markone-tools.com/upload/files/12921779048.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efbf8801c3---7183679416.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/48192411915.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088b15072b3b---lubodadopubabegidiwexoseb.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/6d14gj0l7skvihbnri559smsvo/bubukagipatifuzukakel.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/vukerubodorimug.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/96798391877.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/luwetoxu.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/tifekozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=le+besoin+de+fond+de+roulement+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/53107680290.pdfIn PDF document text
    • 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_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 19172 bytes
SHA-256: 7d51410fa4f5a3fc22e96e092e7a2e60d6ce8ac9b3e64a78b8cf21fee5ba81a7
font_01_sfnt_off000115ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BA 10692 bytes
SHA-256: a56f18b9ba16c7db151629623557287e54b3f8f81d72ff0103abf1f236775349
font_02_sfnt_off00012dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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