Malicious PDF — malware analysis report

Static analysis result for SHA-256 41be5d7ebd387ac7…

MALICIOUS

PDF

130.5 KB Created: 2021-07-01 10:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eab91afa46b0cf490833ca99140319bb SHA-1: 26fa613672a3b8567ed1ac6b2f54dbeed260833f SHA-256: 41be5d7ebd387ac7b415086cf3fe55ded363a54478a453ef6db76f6f9c5e24ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/6e12c9f9981efdb656cfcf2ba537ee90/42558144822.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a44a702f61f---limobafafot.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c94fe2d8a---50778921226.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/wonafitusudipidupakaxofe.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d71acbdb3---79975007796.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ngs0tjok7es9t1fmsvmied98lu/58912660504.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6b18a8ff3---11288455402.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fedfa4f608---10923096985.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/c808437260d46456c44fd94ce20b2f62/71700259092.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/54181203535.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/8d4da992aae2a15903163a841b72d1b6/sejodubisuroraridipiso.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/lasefazusebul.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5834e2380---pusomidi.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/xazodanajewigiwewurogo.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/2a2d3fc7e5e830a63d52b2fe6bca3d07/mopadinawepupotuvax.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160904b23b685a---fejabuxit.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160887102a63a9---wekapevesupufunidupawixa.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609214d12c2a3---84499682978.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b3ce1c988---46291464671.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/36569180956.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/nezax.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/86256468835.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/62766443702.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/36708593142.pdfIn PDF document text
    • https://abeess.com/userfiles/file/jatatuduwiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=low+ejection+fraction+treatmentPDF 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_off00019d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D1C 17952 bytes
SHA-256: b972bcb634dc9e7fb4b3f77f2f112088507a4e8ee39c6b7ec4fd761a9ed1c2d8
font_01_sfnt_off0001cc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E474 10456 bytes
SHA-256: 545220f7ba13d75ba971c8dc8e54a02e8f91c2f2d2bd1b6f325f3bda864ae8ba

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