Malicious PDF — malware analysis report

Static analysis result for SHA-256 dedffb55fbaa2159…

MALICIOUS

PDF

89.2 KB Created: 2021-09-06 23:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 47a8a32f08ed0e02bd20166e48a2d8cc SHA-1: 9817066398a03bc44e8b52f4e88d257152f72176 SHA-256: dedffb55fbaa215932d3729ef1808cabb223178cade0bf2eb41301168deeb059
96 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous other PDF files, many hosted on compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to obscure the true destination or distribute further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • 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://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/dc353f02babb95eaecb394aaa8454960/76970651183.pdf In PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/26374181505.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/866570921.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/logugatizikezapataruruzik.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/72018853453.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/28e0affd63d083efc1fd78cfca6bcb7b/93372299132.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-03/images/files/ribowipokozaratuk.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/997d4acba60e35ed07f555fa151a82c9/mopazanuguzikewevab.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/38sc6nmudshrn69bus774jhsfj/narikaduxulimufalizamox.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/mutidumidit.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3bvs5vg72gkkm4lsi6spcmom71/jotuluri.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/sabazomenubilozagazirir.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b850ec3e59f---2596604296.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/sesadupitukidawofawiju.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/26275341448.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/jewutifirasa.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/65513006694.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/71528546751.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b7416b6d5---sijuwan.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/67022556623.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109977e9e652---58258992524.pdfIn PDF document text
    • http://alltechsro.cz/files/bagujazujuwovegalit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=corel+paintshop+pro+2018+user+manualPDF 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_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB2 11152 bytes
SHA-256: 1b6ab593e46c2a4030bbece710c10b5cf137e921cf5697c6da6f38db1c34c7a3
font_02_sfnt_off0001279f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279F 18312 bytes
SHA-256: a88882129b87d3f68d7ea31d85f2a2060512bff11f2c8785eacbcf1fd4925e1c