Malicious PDF — malware analysis report

Static analysis result for SHA-256 326ebf4a27857481…

MALICIOUS

PDF

86.5 KB Created: 2021-07-19 03:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 08f6aeb6810405247305f3fc09383e70 SHA-1: 4256ca7f3fd4b729184206f80568bcf04178b0e9 SHA-256: 326ebf4a27857481934633a4d88563e3bbf5f4de4885a5b408b34f6d1d9a3fb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the link farm indicate a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ecf90e74e004cff193df858ae7a1acf4/96528291320.pdf In PDF document text
    • http://igabana.com/upfolder/e/files/20210620063503.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/36f7e1a0464e96880ec0747fcfff079f/femetafajagilorujug.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/17574799270.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/fb250f9b64c3eaf3cd4a2319c984a06b/8456656424.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/lujozafewugutuj.pdfIn PDF document text
    • http://atya.eu/files/file/24592205938.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/25190501189.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/40731706093.pdfIn PDF document text
    • https://banghenails.com/upload/file/24123643237.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/64072219924.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a9d1c25099097629cd6eb0a92f6233c8/fimovodaluvuzetamun.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d861c2afb---vajofofojofup.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b067a1c3---rinagetoteselusoludara.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/60224344066.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/aepg2rp3jd9g5fcfr1kcea2ub3/nilizoteluk.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e553ab162f---kakomemudexotapuvosag.pdfIn PDF document text
    • http://technocom.pl/editor/file/39653139272.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/44659493239.pdfIn PDF document text
    • http://lulanjina.net/upload/files/24622835961.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b981c3941c5---75814184139.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/39166923385.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/garatekakanalujinoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=is+parchment+paper+safe+in+the+ovenPDF 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_off0000ee98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 17680 bytes
SHA-256: a3b167f2021168bb3aae6083c0a4c33f1c975db0b9f91100422ca2322a1ccdf3
font_01_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001340d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340D 10716 bytes
SHA-256: c5c480aa744387fcebcb7ac7e580411e9f5340cb6006bad0dff4fe3fdaad4cfe

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