Malicious PDF — malware analysis report

Static analysis result for SHA-256 c524e6e554c5743a…

MALICIOUS

PDF

75.9 KB Created: 2021-09-19 18:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ffdb08b97bf7ae410aacdf5e6128a7b SHA-1: 7c6d9a89e149f77e582ff7d11fe91415106527ab SHA-256: c524e6e554c5743a5ec830dde121005c415e6e9cb9c55ec3ce9a3d5cf6642e94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm with numerous URLs, some pointing to potentially compromised CMS upload directories. The primary attack pattern appears to be a phishing lure, leveraging these links to redirect users to malicious or deceptive content. No scripts were extracted, but the presence of multiple external links suggests a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://perfect-gallery.com/userfiles/file/57854525021.pdf In PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/rmu808junft74v5ovrrv66t8i5/1873434226.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/nulusamafukutigatuvib.pdfIn PDF document text
    • http://meteoratourismactivities.com/files/files/bosisaxunovebute.pdfIn PDF document text
    • http://labonscafe.com/userfiles/kinizak.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210907005047629990.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1ac7c52a87cd2858f0b53ee6d4235638/69580122584.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/vudida.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/sokexetasikibaveluveronaf.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/39153124136.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-15/20210915171415693353.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/95147548926.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/62676256004.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/32617676354.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/77393372350.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/nevozobaromamoju.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109152357088020.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/80902907574.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/wekopenaxirevifu.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/91050857977.pdfIn PDF document text
    • https://noventa.cz/media/files/file/pofijaxixozavoti.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/96121247851.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3a4872adffb60420fbb8b123475dce03/warimurabalonujopase.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/pavimovixalokuraravefewen.pdfIn PDF document text
    • https://kuepancong.com/contents/files/fuvet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=marjaavaan+full+movie+2019+sidharth+malhotraPDF 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_off0000bf50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 11368 bytes
SHA-256: 1bfbdddac1f7e89ec2a235fd9fed5adf06b15ba148def8a097ee4439d83edfe0
font_02_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 17788 bytes
SHA-256: 3e022997a1996646207238929a63ccedbdeadb1e78719251f724b245acbc2a1f

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