Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbdfd5735bd4c9f…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 19:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb31695b089de9c684a8eabe8ea6b4e0 SHA-1: 20ee445ee6c66282b221036e7c06b935cacf9c9a SHA-256: 5dbdfd5735bd4c9fb2e4abc1c33ff474cfcf4d7d93a482bf9755a5e68dcdf766
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised WordPress sites and disposable domains. This technique is commonly used to obscure the ultimate destination of malicious links, often leading to phishing pages or malware downloads. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=sugarcane+machine+manual PDF link annotation
    • https://masihpt2.com/contents/files/37433390041.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501021441860775.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc2098d99f---20752754488.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/vijad.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210826092011.pdfIn PDF document text
    • https://renault-service.com/userfiles/63150516010.pdfIn PDF document text
    • http://specimport.by/files/files/pazomukopevasemitono.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/77537180515.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/3a131ef597dcc3572a9937d6a5aeed9f/sebolesutiganuvo.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613013fab37d8---88538302732.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/0399c428deef91978b06912e8645e6fb/11402745228.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/20262358575.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ic8o2r4s1ja3hmur1ugni9m042/nenumuvew.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/kudanafusivi.pdfIn PDF document text
    • http://gabortech.com/admin/file/karizikera.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7545c1b09202669ceb538617808da94a/19995752771.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/69445125330.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_off0000be99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE99 17664 bytes
SHA-256: d1ab59ca8d79ffd77d9ae0896bb7b865292e00bfdbd428e5aeacda0fb2b6307c
font_01_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 10468 bytes
SHA-256: b0626314a7666699f482fcfbff4d8623ea4852a234edea8744d264ae37aa22a0

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