Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87687b6f6dff7be…

MALICIOUS

PDF

93.6 KB Created: 2021-08-01 21:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7c8482030d81b263137ca2703951f3b1 SHA-1: c8d38213bdbae76faa2de2360488843b94c1010f SHA-256: b87687b6f6dff7be3b56c87e1ea6a786e19e54a3d9d6b51283307e1f0fa543b6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous external URIs and embedded links that point to various websites, many of which appear to be compromised CMS installations or disposable hosting. These links likely serve as a link farm to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=how+to+use+laser+lipo+cavitation+machine PDF link annotation
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/77lio0u2nmgc5jj036cotocqoc/59842584249.pdfIn PDF document text
    • https://nadamasristorante.it/file/34886068203.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/65906090914.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/bukakewikejalolezuwivifuz.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/konifuvapupiv.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eef51d6d4f---28589313399.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/16761695400.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cceadb81d---kuzunalu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3ef9eab0a---4002120056.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/dipusudobajokuta.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/ratirojuzubajinogazola.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/turujemajulipebelodu.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///93085326252.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/57c1468288a744b2886de9e49c7d0689/nebaten.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/93511045916.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/jolurogixujipuvemet.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d8a6ec242---dixukasoboxuw.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/65050557036.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/26172509708.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdfcdd2525---36634890350.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608401989d505---50414948109.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/71354709742.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/moekki64saoupajasc0bh4u9b0/82143073128.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/93214154f4f416a8aadd14f65bdb30fd/rokibazijal.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_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 10880 bytes
SHA-256: c8520ff47d09c46a72f2fde5e3a416dbca59b86a7373affa534e61ede4550440
font_01_sfnt_off00012046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13858 17644 bytes
SHA-256: 66689605c7efcd075f92322a65aaa51e29a11a40ab5107fecb1884026f72e991