Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f100fecaaa7b2bb…

MALICIOUS

PDF

84.2 KB Created: 2021-07-03 04:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2e952ac8521d395c569085588024e0e6 SHA-1: 9f61a75f2c46d677a6b06405caac093a77b2a79c SHA-256: 4f100fecaaa7b2bb9326bcb0858b3ef95aa9a581578d9991f837d09ecdab6e02
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, pointing to numerous compromised CMS upload locations and disposable hosting sites, likely to distribute further malicious content. The document's structure and content align with a classic advance-fee scam lure, aiming to trick users into believing they are due a prize or parcel.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://philabc.ru/uplcv?utm_term=small+introduction+about+yourself PDF link annotation
    • http://gernano.eu/gfx/userfiles/files/12286701547.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/37324e870f15952a74ef436f324d4ec8/64596348787.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/13845408205.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/48400625135.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ptfnjae61vj9jva72d7fpuuru0/wufetinolipefo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efbf29bda1---84219962453.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/93218579380.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/vijudofolaxesusawabuw.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/16814787033.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba27c97edd6---lapubimuke.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/walixasedefoxaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607749584ffde---16864115984.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e70ea8974---mizumixupowadige.pdfIn PDF document text
    • https://businesslife.com/content/files/91300058972.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b1f48a7c4---zogopetufiropaniletu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafb8a51c83---91423860080.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a983b213f---pegojilozaje.pdfIn PDF document text
    • http://klhl.com/userfiles/file/73144900617.pdfIn PDF document text
    • http://pestcontroluttara.com/ck/upload/files/tinemipurirexiwaniva.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/ffa1d977c2d33c750eb096464bfc6786/90788800543.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/cbffaacb256c3a1df8188e286904ec28/kigudewesakigu.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_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 16636 bytes
SHA-256: ea99f2b1afad2604efbaa6fab31729ed1a105c8768cc70e2d6a3416bc26f921e
font_02_sfnt_off000129fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FB 11064 bytes
SHA-256: 41265d0d61414c8d19b276b6cd455f3100b76d5bf6aba20542b8e6f603c9d15c

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