Malicious PDF — malware analysis report

Static analysis result for SHA-256 8315fa1010828b59…

MALICIOUS

PDF

69.4 KB Created: 2021-09-04 05:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b0483a0e920a3aec72cc83b8fa33599 SHA-1: f5f8e8885db038898c84488f35054ee45d947893 SHA-256: 8315fa1010828b59e9a01b5f6d6eb1910ceb0ef4f9195d69a4f4e8922c587bab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.physedu.in/newsite/userfiles/files/gafisorolug.pdf In PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/babinubim.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/39849050788.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611df71f4bbbc---koribi.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/38960395697.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87e5633b61---22071384662.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/8311bf7bdbee8dcc1270e330eda9a0b4/nigigavixumo.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/4554965439.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/saridiroxobivafozifiv.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/pegewo.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/fj2hmdo5h9hvs5e9crejps1lf7/47246932164.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/bamoxogoxurowuredozebafok.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/84737424281.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc49cff5f---rimujisiranovulakaferuf.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/82446310807.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/95159191476.pdfIn PDF document text
    • https://signika.pl/Upload/file/pozodilan.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/zomaxuru.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103e24edbabd---68274513641.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1628335333.pdfIn PDF document text
    • http://robbes.nl/media/files/madodef.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5adf9ba5b---29794331512.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/doragomerofililuxafinavan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=candide+r%C3%A9sum%C3%A9+en+arabe+pdfPDF 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_off0000afcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCC 10820 bytes
SHA-256: f7d597943a1a105934e8711700041b144f76ef90f670441c50def7e9173aebb1
font_01_sfnt_off0000c828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC828 15432 bytes
SHA-256: befc9b355af2d50a73200ba8de3d4a06998538ae901c75e9de9283973617dc6b
font_02_sfnt_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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