Malicious PDF — malware analysis report

Static analysis result for SHA-256 46806d90c321039b…

MALICIOUS

PDF

96.0 KB Created: 2021-08-11 14:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b2f5ec049a83ee9fc0ae959c4cecbf57 SHA-1: 18cdf0c05b7e76b41b9e9f321a29c1c66b23f767 SHA-256: 46806d90c321039b4194a4bcebeea7c1389588900b77328640dccd47123f5c34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec66b0a283---45070742483.pdf In PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/893fb98c4e4094b59806d5598124f286/pipiweli.pdfIn PDF document text
    • https://bselink.com/userfiles/file/bejikiduteru.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609be0767a022---91262342516.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/tokivuxesivufux.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/64953524952.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8ba761d90---mudeposojojazi.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/9165224995.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/mefixomone.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/0jmsal0kt3fbfhm9omaqfkfbj9/xavasis.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7dd4891ce5404af25670540e50173166/varamenolijugugadusoxemu.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/l1fak5j2di6802pukua79vaiqe/regupofazus.pdfIn PDF document text
    • http://multiairservices.com/multi_air/upload/userfile/files/bexovaruginesenosovuba.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8cf3b6e64fecf1547ecac592b63c36ab/dagevogawipufoteda.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/27649248151.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdf58e2801---gebafuj.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/j8n0vkfo62aekf3i0s83cf2t8t/5673694077.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/qlbna9e0nbdbvpn9bomd9vo0b2/75681110108.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/922278eeb7d92e3b79d9dfe6244ff90c/32622652782.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/logasifisapolemav.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/8cfdd806c3c7bf3f47b1116a88055e25/vejezitumosojelitazurot.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1ea4c969---78336329186.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/jedepuzopovizopovalu.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/07/file/ridage.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/voketobab.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dakapol.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/503d0a20a4086a5227d4a740590a2b5a/82533585684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+use+ge+profile+oven+probePDF 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_off00010faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 17928 bytes
SHA-256: 89e64b8e7ac3aefdb09477825e88d9bf21b6e21bcc4f3f2f3c488d3c1a8d92a9
font_01_sfnt_off00013eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15701 10756 bytes
SHA-256: 5aa0f659fba0b8a4c2eb257e10834cc7786ac80ec6e0f4a2c1384eee093ff799