Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e318a3ebbe9bdb0…

MALICIOUS

PDF

84.2 KB Created: 2021-07-06 13:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c5bd283628d81abc4c6f8d0f589a8c51 SHA-1: 0fdd05a74aaf8f4bc2434cda5db65bef840a935d SHA-256: 8e318a3ebbe9bdb023c12f99b52692cf0b2088983f75f8c4957d53f97d28fa16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to direct users to malicious sites. The embedded URLs, while numerous, are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/fb1bd7f695a2e9055833d8ec2376e5ac/84019119902.pdf In PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bee61b84cc5---84590374943.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/jckuqpnd81aj25i17hm1aif2dn/vidavox.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/94548049032.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/wegavibadosevakexugalir.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205555277d---botidasiwazi.pdfIn PDF document text
    • http://whatdwellswithin.com/file/xivepofegotumulubejejilu.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071681fd486d---13114732134.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/wikoximoz.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/68475570240.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/nekotafexot.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/kenafowobopegibogib.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/zebajubejenugevaxixinuju.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0c33e32eb---66716109495.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d194870a3ed---xuvoxeso.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160705637ec541---guxalumovitaxezupilovezuk.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/kpbeo18nv5tq00bl7mv6041bcn/vojubowekumu.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/57951545326.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4fd52c6fb9a186b538895e8f2b0fdea6/89458102923.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/gelevokoxezojiw.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/dakinagasamosomavevimaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=care+core+cure+theoryPDF 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_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 16832 bytes
SHA-256: 9a1a9767e7a2342c89cb94852c661ce5ebafc880368fcd09e486d76dd401ec3a
font_01_sfnt_off00011518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2F 10164 bytes
SHA-256: 49a313bb51be328d2ad4a0fbc7ea57cd4b41c0d6391581fe6e2fe52e69970b38

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