Malicious PDF — malware analysis report

Static analysis result for SHA-256 baee5230f0adf536…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 14:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f04e5b96385cf5379fed1b766971cd6 SHA-1: 5f304ffd2c8563a9142f468b60721d185bd2e6b7 SHA-256: baee5230f0adf536b0e83f406231e1f3f6ad014cb7221d639fec77de509dc5c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=zuma+deluxe+for+android PDF link annotation
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7953fceb33e4d1ac0d68d8e9e979faea/45840844793.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/15049992515.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/wakefubosazuwabon.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/gulokosomugivevebejexuvog.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/93912941145.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c657fde07f---napulilivesoxoxamoko.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613248e2bbdd0---wojivolatanuwugafiweke.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/81582043487.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/wulum.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/namosadazonudamufomoriz.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/begese.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/75451029324.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/tchacep54gos9iulkrteo8hfu5/sodoferigadogapesirufepek.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/vefukizezijogina.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/87389934064.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/nekututitop.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/dogipixolag.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/23752420824.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/vunon.pdfIn PDF document text
    • https://people11people.gr/uploads/File/kepitakabipado.pdfIn PDF document text
    • http://bptramptour.pl/files/file/90949501633.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/57170610607.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/8514441326.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_off0000cb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5E 10412 bytes
SHA-256: a880c00592f301ab33271d6ab52c9683806a6aefd206ae547fa7f6b7c1a4c95e
font_01_sfnt_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 23612 bytes
SHA-256: 69f9af4646006651f708d4cbb7a449c5b60006ee2fdca2a75c25ab5ed0305b1f
font_02_sfnt_off00011e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1