Malicious PDF — malware analysis report

Static analysis result for SHA-256 b146f8a7dfd25ede…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 01:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: be09f0704a76c72dac62694443c9e26a SHA-1: c208ada76f8f159cc320e156615a3a9f9dafe54b SHA-256: b146f8a7dfd25edeb15cfc0f980c02449d3fc59eec676614c231d9cd93c842a8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards an attempt to download further payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=periodic+table+with+orbital+notation PDF link annotation
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607775daa7569---bupusuwo.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/bijadebave.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b95098126---mopaxabefoxenitaxezawefa.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/dinobupadawo.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93b9d154bb---5736192362.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090be755078e---gavevisilemip.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/sevavukibuvuvadube.pdfIn PDF document text
    • https://inncredel.com/uploads/xejesifonevoner.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/97211389962.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/nepiwevebosalenugak.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b7a7aba9708264baaa57f85d6ef8883b/47557934680.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/369979d3b55482167a36f23ebbe40fd1/rolelevevivob.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/31436375722.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/venix.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/fetij.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/16662621377.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/20102418000.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c63ef69d1e2---fogipikepeposexadurer.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608825b012faa---ximorevujizanejipij.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4df3d9fe5a---25712797518.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/21000043311.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/bazeg.pdfIn PDF document text
    • http://recrute.fr/files/files/mejadakepaxegivagabe.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b321f8c791---dimudurow.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_off0000ec0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10420 16920 bytes
SHA-256: 0c42dcaabe655bb1a406e66586357b8635f22b0a60f7329e5da3c827bd59ae90
font_02_sfnt_off00013013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13013 10528 bytes
SHA-256: 9e7c040d9ef782cbe7eedc968282429c16a43d1fe12c9413dd211110b0903bed

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