Malicious PDF — malware analysis report

Static analysis result for SHA-256 47540c8a342ee4e8…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 13:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ccce014dc98369095d8ef451ecb35ca SHA-1: 6903272634909218d028d4d2c428df29d8108740 SHA-256: 47540c8a342ee4e881a8deb416d27cac700e03dfc600ce12eae812a449eaca70
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the overall pattern of hosting numerous links on potentially compromised infrastructure is a common tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://phrabat.net/UserFiles/File/93095257829.pdf In PDF document text
    • http://sz-nuoyi.com/Upload/file/2021081607592325031.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160beb0b502634---kutafukadigovoboxuvavab.pdfIn PDF document text
    • http://yoron.net/up/files/22819078027.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/guvedurufafuwopi.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b69d62c1b---55444740922.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/f244eh9ssd4sgigi8tbakjqgft/birazagutaba.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/73367871601.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/21c3bc79d501ed8321bd87fa2b889ac5/rurabekoxoli.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/80424221495.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed4106fa08---wewupunilobolizabavad.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/guxogovirofen.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/suwulajatelut.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/80215783177.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/tuwofewikediwawigudegax.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/302358408126.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/71912612072.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/duredudomosu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8959374c55ad36a664b865e58c32289b/vuviji.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/jukepivafegitowadal.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3e33b91c720b45d67399501e4ff85cf5/pogalu.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/wezuru.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/92323226002.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708462d3149.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9141d87a6---fitibeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=wind+and+window+flowerPDF 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_off0000e378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 10160 bytes
SHA-256: 5f19fbb1f9553633337e74ac3dd4c5c7aedd695851e5d9410dc03c7c2d0aa967
font_01_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 17456 bytes
SHA-256: 3948c1e66bb4d973dfeb46ed136919558012bd084f95f437de41b8053f37b13e
font_02_sfnt_off00012780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.