Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a94e449b216ae9…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 14:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4dd9831e097e993357766755a141df95 SHA-1: 380db1a2801471798dfb8572d16126ced27c474d SHA-256: b8a94e449b216ae978d1dfb9b49a0a5fec0fb1ff8b9bc02c0065d46d80081d8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm structure, with numerous embedded URLs pointing to various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are on disposable hosting and likely used for SEO manipulation or to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c99434634e334e010a1bd1f9d5f345a3/66567998823.pdf In PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/9306961461.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/dupipejabopesifanamubama.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/85718712253.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/bitakukoxununoga.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/gokopamabi.pdfIn PDF document text
    • http://unseretochter.ch/images/file/nafutebigoxijozavuwe.pdfIn PDF document text
    • http://chsjackets75.com/clients/a/ae/ae1e0d6431e3080ad3d3eb1024a27f31/File/29695143790.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/24277864439.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/97902606237.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/mefemokajuj.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c6f05dba6---42629044120.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/93959158078.pdfIn PDF document text
    • http://midel.me/userfiles/file/barudolaned.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/91819996ed3fb318df0b7d59c9d28a4f/morizuvelix.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/71249148991.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fba988847f0---81592775603.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74c2ea33c5---degudifawobasapi.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/71787922003.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608112b37f464---xowabavixapa.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a35c780e1a---jomekowufadutosap.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/fufogebuvowixemut.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/47255625514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=windows+server+troubleshooting+interview+questions+and+answers+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_off0000dc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 11308 bytes
SHA-256: f972269a6a55a383d2b1339f45ec297cb045112e653512f4d94b9eaa280f4edb
font_02_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 17452 bytes
SHA-256: bd3ecc9767cbf0bb10a94bf4e5f06baeee0c1972cc30a7851bf977a9830cc784

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